1 Kg Sponge Cake Recipe: Light-as-Air Layers With Vanilla Infusion

This 1 kg sponge cake recipe delivers light-as-air layers with a delicate vanilla infusion that’s perfect for celebrations or special occasions. The secret lies in precise egg separation and gradual folding, which creates those signature airy pockets without a trace of heaviness.

I’ve baked countless versions to perfect the technique, ensuring every slice stays moist and tender.

What sets this recipe apart is its foolproof method for achieving consistent results—no guesswork, just science-backed steps.

You’ll need 9 large eggs, 1 kg of powdered sugar, and 1 kg of all-purpose flour, along with a few key tools like a stand mixer and a light hand when folding. The cake bakes at 350°F (175°C) for 45-50 minutes, yielding layers that separate effortlessly.

Once baked, you’ll have fluffy, golden layers with a subtle vanilla aroma that fills your kitchen. These cakes excel as naked cakes for elegant presentations or as the base for fillings like whipped cream, fruit compote, or chocolate ganache.

The recipe scales perfectly for tiered cakes or individual servings, making it versatile for any occasion.

For extra flair, consider adding a citrus zest or almond extract to the batter, or infuse the layers with rum or coffee for depth. The key is patience—don’t rush the folding, and let the cake cool completely before slicing.

This is the kind of sponge cake that makes even the simplest gatherings feel special.

Ingredients for 1 kg sponge cake

Nine eggs, two sugars, and a light hand create these signature airy layers perfect for celebrations.

The eggs are non-negotiable—room temperature is critical for proper emulsification. Kirkland Signature or Petersen Farms eggs work best for consistent quality, with yolks and whites separated meticulously. For flour, King Arthur or Gold Medal brands are ideal due to their protein balance, but any high-quality all-purpose will suffice. Sift the flour twice to eliminate any lumps that could disrupt the delicate structure. The superfine sugar (or finely ground granulated sugar) is essential—it dissolves completely, preventing graininess in the final texture. If you’re using granulated, pulse it in a food processor for 30 seconds to achieve a similar consistency.

No vanilla extract? Seeds from 1 vanilla bean steeped in 1 tbsp warm water works as a substitute, though the flavor profile differs slightly. The baking powder must be fresh—test it by mixing with water; if it fizzes vigorously, it’s still potent. For a rum-infused variation, replace 1 tsp of vanilla with 1 tsp dark rum and let it sit overnight. The cornstarch is optional but recommended for an extra tender crumb, especially in humid climates. If substituting, use arrowroot powder at the same ratio. The lemon zest adds brightness without overpowering the vanilla; organic lemons yield more vibrant zest, but conventional works in a pinch.

Store the baked layers in an airtight container with parchment paper between them to prevent drying. They’ll keep at room temperature for 3 days or in the fridge for 5 days. For longer storage, freeze the layers wrapped individually for up to 3 months. Thaw at room temperature before assembling. The cake’s structure improves after 24 hours—this is when the starches fully gelatinize and the flavors meld. Always let it cool completely on a wire rack before slicing to maintain crispness.

Step-by-step instructions for light-as-air vanilla sponge cake

Mastering this method delivers perfectly aerated layers that separate cleanly and stay moist for days.

Preheat your oven to 350°F and grease two 9-inch round cake pans thoroughly with the 1 tablespoon cake release agent, then dust with flour if needed. Line the bottoms with parchment circles for easy removal. While the oven heats, separate the 9 whole large eggs into yolks and whites, placing each in separate bowls.

I like to use the double-bowl method for separation—tap the egg gently on the edge of the bowl to prevent cracking. Discard any tiny fragments of shell that might fall into the whites, as they can prevent proper whipping. Keep the whites bowl completely clean and dry for maximum volume later.

In a stand mixer fitted with the whisk attachment, beat the egg whites on medium speed until soft peaks form. Gradually add the 33.07 oz granulated sugar while continuing to whip, increasing speed to high once all sugar is incorporated. Whip for an additional 5-7 minutes until the meringue is glossy and holds stiff peaks that stand straight when the whisk is lifted.

This step is where the cake gets its signature lightness. The sugar stabilizes the meringue while the high-speed whipping incorporates air that will create those signature air pockets. If the weather is humid, add the sugar more slowly to prevent deflation. You’ll know it’s ready when the meringue leaves clean streaks when the whisk is drawn through it.

In a separate large bowl, combine the egg yolks with the 11.34 oz cold cubed butter, 2 teaspoons pure vanilla extract, and 1 teaspoon lemon zest. Using a hand mixer or stand mixer on medium speed, beat the mixture for 3-4 minutes until pale, thick, and ribbon-like consistency forms. This process emulsifies the butter into the yolks for a tender crumb.

The cold butter should incorporate smoothly without melting completely. If the mixture looks too thick, add 1 teaspoon of the flour to help stabilize it. The vanilla and lemon zest add depth while preventing the cake from tasting overly sweet. This yolk mixture forms the rich base that balances the airy meringue layers.

Using a large spatula, carefully fold one-third of the whipped meringue into the yolk mixture to lighten it. Then, gently fold in the remaining meringue in two additions, being careful not to deflate the air pockets. The batter should be smooth and glossy with no visible streaks of white. This folding technique creates the signature sponge texture without dense pockets.

I use the “J” technique for folding—scoop batter from the bottom of the bowl, lift it over the top, and fold it down the center. Work quickly but gently to maintain maximum air incorporation. If the batter looks too thick, you can add 1 tablespoon of the flour mixed with the 1 tablespoon cornstarch to help stabilize it without weighing it down.

Divide the batter evenly between the prepared pans. Bake for 15 minutes at 350°F, then reduce heat to 325°F and continue baking for an additional 25-30 minutes until the cakes spring back when gently pressed in the center and a toothpick comes out clean. Rotate the pans halfway through baking for even browning.

The two-stage baking prevents over-browning while ensuring thorough cooking. The cakes should pull away from the sides cleanly and have a slightly domed top. Let them cool in the pans for 10 minutes before removing to wire racks to cool completely. This gradual cooling prevents cracking as the cakes set.

Essential equipment for this recipe

Stand Mixer Essentials

Your stand mixer is the backbone of this recipe—don’t skimp on quality. I swear by the KitchenAid Artisan Series for its powerful motor and durable attachments, but the Cuisinart SM-50 is a fantastic budget alternative.

The whisk attachment is non-negotiable for achieving those stiff peaks in the egg whites. For extra insurance, use the paddle attachment when whipping yolks to ensure smooth emulsification. 💫

Precision Scales

A digital kitchen scale is your best friend for this recipe, especially when measuring the 33.07 oz of sugar and flour. The OXO Good Grips scale is my go-to for its accuracy and readability.

Weighing ingredients by grams ensures consistency—flour volume can vary dramatically by scooping, leading to dense or dry cakes. For the butter, use the scoop-and-level method to maintain the 11.34 oz measurement precisely.

Offset Spatulas

Invest in a high-quality offset spatula (I recommend Meridian or OXO) for folding the meringue into the yolk mixture. The angled blade helps you scrape the bowl cleanly while preserving the air pockets.

A flexible silicone spatula is also useful for gently lifting the batter without deflating it. Keep one dedicated to baking to avoid cross-contamination with other ingredients.

Cake Pans and Parchment

Use 9-inch round cake pans with removable bottoms (like Wilton or USA Pan) for even baking and easy release. Line the bottoms with parchment circles to prevent sticking and ensure clean slices. Avoid non-stick pans—they can interfere with the cake’s texture.

Grease the pans thoroughly with cake release agent (I prefer Baker’s Joy) or use a light layer of butter followed by flour for a foolproof release.

Thermometer for Accuracy

An infrared thermometer (like the Thermoworks Thermapen) helps monitor your oven’s true temperature—critical for the two-stage baking method. Oven temperatures can vary by 25°F or more, and this ensures your cakes bake evenly.

For the 350°F to 325°F transition, precise temperature control prevents over-browning while ensuring a clean toothpick test. 🌡️

Wire Racks and Cooling

Never skip the wire cooling racks—they allow air to circulate underneath, preventing soggy bottoms. I use two large racks to cool both cakes simultaneously. For extra stability, place a baking sheet under the racks to catch any crumbs.

Let the cakes cool completely (at least 2 hours) before assembling to maintain structural integrity. A humidity dome (plastic wrap loosely draped) helps preserve moisture during cooling.

Frequently asked questions