Magic Gluten Free Custard Cake Recipe | Vanilla Sponge with Creamy Custard (2024)

This magic gluten free custard cake creates 3 layers all by itself. The simplest ingredients make the most amazing, light and fluffy cake with a magical custard base!

What is a gluten free magic cake?

When I first sawthis spongelike custard cake, I figured it was some kind of fancy pantscake thathad 3 distinct layers, each baked separately and then assembled or something. (It's not like I'm one to shy away from some fancy pants recipes, like classic yeasted gluten free croissants.)

Imagine my relief (and now I hope yours!) to see that it has the simplest, most basic ingredient list ever (butter, sugar, eggs, vanilla, flour, salt). Don't you love it when that happens?

By the way, if it looks like the most tender and moist vanilla cake you've ever tasted, buckle up. That's exactly what this magic tastes-like-custard-cake is: like our gf sponge cake, but with the richness of added butter and milk, and a creaminess you never imagined.

Why this is the best gluten free magic custard cake recipe

The magic of this custard cake is that it “separates” itself in the oven into 3 creamy, soft layers of cake. The bottom layer of the cake is the densest, most custardy layer. The middle is a fluffier style of custard. The top is the lightest, fluffiest cake, most similar to a sponge cake.

Every single layer of this rich, but light, vanilla cake melts in your mouth. It's an elegant-looking dessert that will impress your guests, your family, or just yourself!

GF custard cake ingredients

• Gluten free flour – I use Better Batter's classic gluten free flour blend here, and get consistently good results. It already contains xanthan gum, so be sure not to add more or your cake will be tough.
• Cornstarch – Adding some cornstarch to the flour blend gives a lighter, softer result. If you use a high starch gluten free flour blend, like Cup4Cup, just use more of that blend to replace the cornstarch.
• Eggs – There are 4 whole eggs in this recipe, and they must be carefully separated into yolks and whites. If you have any yolks at all in your whites, they won't whip into the peaks that you need to help this cake develop its unique baked texture.
• Lemon juice – The lemon juice acts as a stabilizing agent that helps the egg whites to hold their shape when they're beaten. In its place, you can use 1/2 teaspoon of cream of tartar, but I really prefer the bright flavor of the lemon juice.
• Sugar – Sugar is both a tenderizer and a sweetener. Don't reduce the amount in this lightly sweet cake!
• Pure vanilla extract – Vanilla is added for some depth of flavor since this is technically a “vanilla” cake.
• Butter – Unlike our gluten free sponge cake, which is very similar, this cake has butter that's been melted and cooled before being added to the batter. It adds a richness that sponge cake doesn't have, and helps the cake to form that dense, creamy bottom custard layer.
• Milk – Use something with plenty of fat here, like whole milk, to add richness, tenderness, and moisture.

Tips for making this cake perfect every time

Whipping those egg whites right

I don’t mean to brag, but I happen to know the most important details when it comes tobeating egg whites until they’re them light and fluffy but still stable enough to handle some manhandling as you incorporate them into a cake batter.

First, you mustbeat the whites until they’re stiff (but not ever dry, where they start to look a bit curdled when handled) on medium-high speed—not high! Egg whites are a lot like whipping heavy cream in that way: whip them too quickly, and you have an unstable mixture.

Second, you always want to add some sort of stabilizer to the whites as you beat them (here, I used lemon juice, but sometimes I use cream of tartar or a tiny touch of mild vinegar).

Finally, if your recipes calls for sugar, beat some sugar into the whites. It creates a glossy, stiff and more stable peak.

Choosing the right baking pan

I recommend baking this cake in an 8-inch square baking pan, one that's ideally made from cast aluminum or stainless steel since a cake that's light in color and sturdy bakes evenly and never too quickly. I don't like baking this cake in a round cake pan since the flat sides help the cake rise steadily and evenly.

Give your custard cake the space to rise

This super special cake actuallysmells and tastes like you’re eating custard by the forkful. To get it right, other than beating the whites just right, there’s another secret to success. You need to know what to expect as it bakes.

The cake bakes up pretty tallat a relatively low (325°F) oven temperature (it’s ready when the top is lightly golden brown and the center springs back when pressed gently), and then shrinks as it cools. That’s how you get that custard-like center.

It’s like you made a soufflé, and you intended that it would collapse a bit. Hey, I wonder if that is how this magically delicious vanilla cake got its start?!

Don't rush to slice the magic custard cake

Be sure to let the cake cool completely before slicing into it, or you may artificially deflate the cake. Plus, slice it into squares while it's still in the pan, rather than removing the whole, baked cake to a wire rack to cool. It's meant to cool in a contained environment, so it compresses a bit.

How to store your custard cake

Can I make magic custard cake in advance?

This cake is really best the day that it's made. Otherwise, you'll need to store it in the refrigerator and that can be drying.

Can I freeze leftover gf custard cake?

Yes, you can freeze this cake after it's made. Just let it cool completely, slice it into squares with a sharp knife, then lift each piece out and wrap it tightly in freezer-safe wrap. The pieces may shrink a bit in the freezer, and won't taste as fresh when you defrost them.

Custard cake ingredients and substitution suggestions

Dairy free custard cake

The dairy in this cake is in the form of melted butter and warm milk. In place of melted butter, I think you could use vegan butter (the best brands are Miyoko's Kitchen and Melt). In place of milk, try using an unsweetened plant-based milk like unsweetened Ripple brand (it tastes so good, and has tons of protein and good fat!) or almond milk. Avoid anything that's fat free.

Egg free custard cake?

This cake has 4 whole eggs, separated into yolks and whites. The yolks are emulsified with the other wet ingredients and provide richness; the whites are whipped into peaks that are folded into the batter and help create the fluffier layers. It would be quite difficult to replace the yolks, but the whites may be replaceable with whipped aquafaba (the brine from a can of chickpeas).

Custard cake variations

This is a really simple cake and there's a lot of fancy chemistry going on in the oven, but we can still change its flavor profile gently but effectively without ruining anything. Here are some suggestions:

• Almond gluten free custard cake: replace the vanilla extract with almond extract and sprinkle with very top of the cake lightly with some shaved, raw almonds;
• Coconut gluten free custard cake: replace the vanilla extract with coconut extract, and sprinkle with very top of the cake lightly with some dried coconut flakes;
• Lemon custard cake recipe: again use lemon extract in place of vanilla, use 1 tablespoon more freshly-squeezed lemon juice in place of 1 tablespoon of the milk, and add some finely grated lemon zest to the raw batter.

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