"Eggless" and "sponge cake" sit at opposite ends of the same question. Eggless is about what's missing from a recipe. Sponge cake is a specific technique — whipping eggs into a stable foam that traps air and gives the cake its lift. Of every cake style we make eggless at Num Num's Bakery, a true sponge is the hardest to reproduce convincingly, and it's worth understanding exactly why.
Australia's cake market reached USD 1.16 billion in 2025 and is projected to grow at a 3.03% CAGR through 2035, according to Expert Market Research Australia, Australia Cake Market report, 2025. Sponge-style cakes remain one of the most requested light-textured options within that market, which makes this comparison one of the most common questions our customers ask.
- Sponge cake's entire structure comes from whipped-egg foam, not chemical leaveners.
- That makes sponge the hardest cake style to make genuinely eggless.
- Our eggless "light" flavours are closer to a butter cake than a true whipped-egg sponge.
- All 15 Num Num's flavours are 100% eggless as standard.
- Order with 48 hours notice — WhatsApp +61 425 697 725.
What Is the Difference Between Sponge Cake and Butter Cake?
A traditional sponge cake relies on mechanical aeration from whipped eggs, which trap millions of tiny air bubbles that expand in the oven's heat. A butter cake, by contrast, gets its rise mainly from chemical leaveners like baking powder and baking soda, according to ScienceDirect's food science overview of sponge cakes. The two techniques produce genuinely different crumbs.
Sponge cake typically contains little to no fat, letting the whipped-egg foam define the entire structure. Butter cake uses a fat-and-liquid emulsion that coats the flour proteins, producing a softer, slightly denser crumb. That single distinction — egg foam versus chemical leavening plus fat — explains almost everything about how each style behaves once eggs are removed.
In sponge cakes, whipped egg proteins form a protective film around air bubbles, and that foam structure is the primary source of lift, with little reliance on chemical leaveners (ScienceDirect, Sponge Cakes overview). Remove the eggs and you remove the entire mechanism the cake depends on for its texture.
| Attribute | Sponge Cake | Butter Cake / Eggless Style |
|---|---|---|
| Primary lift | Whipped egg foam | Baking powder and soda |
| Fat content | Little to none | Higher — butter-based emulsion |
| Crumb | Extremely light, airy | Soft, slightly denser, velvety |
| Egg dependency | Total — structure fails without eggs | Low to none |
Why Is Sponge Cake the Hardest Style to Make Eggless?
Because a genuine sponge cake's structure is the whipped-egg foam itself, taking eggs out doesn't just change the flavour — it removes the mechanism holding the cake together. There's no direct substitute that whips into the same stable foam and holds the same volume of trapped air the way egg whites and yolks do together.
This is exactly the opposite problem to mud cake. A mud cake's density comes from melted chocolate and butter, so removing eggs barely changes it. A sponge cake's lightness comes entirely from whipped eggs, so removing them means abandoning the sponge method altogether and rebuilding the cake around a completely different leavening system.
Over-mixing makes the problem worse in any egg-based sponge, eggless or not. Dry ingredients need to be folded in gently to preserve whatever aeration exists, since a rubbery sponge usually results from overworked gluten collapsing the delicate structure, per the same ScienceDirect overview. Eggless versions are even more sensitive to this, since they have less structural reserve to begin with.
What About Chiffon and Angel Food Cake — Are They Even Harder to Make Eggless?
Chiffon and angel food cake take the egg-dependency problem even further than a standard sponge. Angel food cake uses egg whites exclusively, whipped to stiff peaks with no yolks, fat, or chemical leavener at all — the entire structure is pure whipped-egg-white foam. Chiffon cake is a hybrid that adds oil for moisture but still depends on whipped egg whites for its signature lightness.
Because these styles have zero fallback structure once eggs are removed, we don't attempt eggless versions of either. Rather than offer a compromised angel food or chiffon that falls flat, we focus our lighter flavours — Vanilla, Red Velvet, and the fruit range — on the achievable target: a genuinely light, moist butter cake that gets close to sponge territory without pretending to be something it structurally can't be.
This is also why comparison shopping between bakeries can be misleading. A bakery advertising "eggless chiffon" or "eggless angel food" is either using a non-standard recipe that departs heavily from the traditional style, or hasn't been fully transparent about the substitution involved. We'd rather tell customers plainly what we can and can't achieve than oversell a texture we know we can't deliver without eggs.
Cake Styles Ranked by Egg Dependency.
- Angel food cake — total dependency, no eggless version attempted.
- Chiffon cake — very high dependency, no eggless version attempted.
- Classic sponge / genoise — high dependency, approximated with a light butter-cake method.
- Butter cake — low dependency, genuinely eggless without compromise.
- Mud cake — lowest dependency, virtually identical eggless or not.
How Does Num Num's Make a Light, Eggless "Sponge-Style" Cake?
Rather than chasing an impossible like-for-like whipped-egg foam, our lighter flavours are built as a genuinely eggless butter cake from the ground up. Baking powder and baking soda handle the lift chemically, a careful creaming method incorporates air into the butter and sugar, and a buttermilk-style acidic liquid keeps the crumb tender and moist without relying on eggs at all.
We're upfront with customers who specifically ask for "a proper sponge" that what we make eggless is genuinely light and moist, but it isn't a whipped-egg genoise. Setting that expectation correctly upfront leads to far happier customers than promising an identical texture we can't deliver without eggs.
The result is soft, moist, and considerably lighter than our Chocolate flavour, without being a true whipped-egg sponge. Most customers who want "something light" are perfectly happy with that outcome once they understand the honest trade-off involved.
Which Num Num's Flavours Come Closest to a Sponge-Cake Texture?
From our order data, Vanilla, Red Velvet, and the fruit flavours (Strawberry, Blueberry, Pineapple) are our lightest textures, closest to what customers picture when they ask for "sponge." Chocolate and Ferrero Rocher sit at the denser end, closer to mud-cake territory.
All 15 Flavours — 100% Eggless.
- Vanilla — our lightest, closest to a classic sponge texture.
- Red Velvet — soft and velvety, with a subtle cocoa note.
- Strawberry, Blueberry, Pineapple — bright, light fruit flavours.
- Rasmalai — South Asian-inspired, fragrant, medium-light crumb.
- Butterscotch — warm, caramel-forward, medium density.
- Mango — fresh, fragrant, light-to-medium crumb.
- Black Forest & White Forest — elegant cherry-cream combinations, medium crumb.
- Lychee — delicate and fragrant, light crumb.
- Cookies & Cream — crowd-pleasing, medium density.
- Tiramisu — sophisticated and coffee-forward, medium-dense.
- Ferrero Rocher — premium, indulgent, denser texture.
- Chocolate — our densest, richest, closest to mud-cake style.
See the full Our Cakes page for photos of every flavour and size options. Every single one is eggless, whether it leans light or dense.
Curious what an eggless "light" cake actually looks like in practice? Hebbars Kitchen (7.8M subscribers) walks through the technique — the same philosophy behind our Vanilla flavour.
Is Eggless Sponge Cake the Same as Vegan Cake?
No — eggless only means eggs are absent. Vegan means no animal products at all, including dairy. Every cake at Num Num's Bakery is 100% eggless, but our cakes still contain dairy — milk powder and butter, both central to the crumb structure that replaces the whipped-egg foam in our lighter flavours. Both eggs and milk are listed among Australia's priority food allergens by Food Standards Australia New Zealand (FSANZ), which is why we're specific about which one our kitchen actually removes.
From our own order data, customers asking specifically for "sponge cake" are more likely than average to also ask a follow-up question about dairy, presumably assuming eggless implies broader restriction-friendly baking. We always clarify upfront: fully egg-free, but not dairy-free, so nobody plans a mixed guest list around the wrong assumption.
For Hindu vegetarian households, Jain households, and anyone avoiding eggs specifically, our full menu works without any adjustment. If you're catering to a mixed group with both egg and dairy restrictions, message us before ordering and we'll walk through exactly what's in your chosen flavour.
How Do I Order an Eggless Cake in Sydney?
From our experience taking orders across both stores, the process is quick whether you're after a light, sponge-adjacent flavour or something denser. It takes under five minutes on WhatsApp, and we confirm everything in writing before you collect.
- Browse the flavours: Check the Our Cakes page for the full menu with photos. Tell us if you want something light and airy, or dense and rich.
- Message us on WhatsApp: Send your order to +61 425 697 725 with your chosen flavour, cake size, any custom design brief, and preferred pick-up date.
- Give at least 48 hours notice: Every cake is made fresh to order. For custom designs or festival periods, 4-5 days notice is recommended.
- Confirm and collect: We'll confirm your order by WhatsApp. Collect from Harris Park or Riverstone, whichever suits you.
Not sure what size to order? The Order Online page has a sizing guide. For a party of 20 guests, an 8-inch round is typically right; for 30-40 guests, consider a 10-inch or a two-tier arrangement. Lighter flavours slice slightly differently to denser ones, so let us know your guest count and we'll suggest the right size either way.
Message us on WhatsApp with your flavour, size, and pick-up date. 48 hours is all we need for most orders. We'll confirm in writing before you collect.
Frequently Asked Questions
Is eggless cake the same as sponge cake?
No. Eggless describes an ingredient absence and can apply to any cake style, while sponge cake specifically refers to a light, airy texture created by whipping eggs into a foam. Because sponge cake's whole structure depends on whipped eggs, it's the hardest style to reproduce eggless.
Can sponge cake be made without eggs?
Yes, but it requires a different approach entirely. Rather than whipping eggs for aeration, an eggless sponge-style cake relies on chemical leaveners like baking powder and soda, plus careful creaming and buttermilk-style acidic liquid for tenderness. The result is closer to a light butter cake than a true whipped-egg genoise.
Does eggless cake taste different from a traditional sponge?
Yes, more noticeably than with denser styles like mud cake. A traditional sponge has an extremely light, almost cloud-like crumb from whipped egg foam. An eggless version is still soft and moist but has a slightly denser, more velvety crumb, closer to a classic butter cake.
Which Num Num's flavours are closest to a sponge cake texture?
Vanilla, Red Velvet, and the fruit flavours (Strawberry, Blueberry, Pineapple) are our lightest textures, closest to a sponge-style crumb. Chocolate and Ferrero Rocher lean denser and richer, closer to mud-cake territory. All 15 flavours are 100% eggless as standard, made in a dedicated egg-free kitchen.
Where can I order an eggless cake in Sydney?
Num Num's Bakery has two pick-up locations: Harris Park (96/96 Wigram Street, NSW 2150) and Riverstone (Shop 8, Riverstone Shopping Centre, NSW 2765). Order via WhatsApp at +61 425 697 725 with at least 48 hours notice, or 4-5 days ahead for a custom design.
15 flavours, made fresh to your order. Pick up from Harris Park or Riverstone. WhatsApp us at least 48 hours before your event.