Soft Milk Sponge Cake

1. Preheat Oven and Prepare Pan: Preheat your oven to 325°F (160°C). Grease and flour a 9-inch round cake pan (or line the bottom with parchment paper and grease the sides). For best results with sponge cakes, you can also line the sides with parchment paper extending above the rim.
2. Prepare Milk Mixture: In a small saucepan or microwave-safe bowl, gently heat the milk and vegetable oil (or melted butter) until warm to the touch, but not simmering. Stir in the vanilla extract. Set aside to cool slightly.
3. Whisk Egg Yolks: In a large bowl, whisk the egg yolks with 1/2 cup (100g) of the granulated sugar until the mixture is pale yellow and slightly thickened. This should take about 2-3 minutes with a hand whisk, or 1-2 minutes with an electric mixer.
4. Combine Wet Ingredients: Gradually pour the warm milk and oil mixture into the egg yolk mixture, whisking continuously until well combined.
5. Combine Dry Ingredients: In a separate bowl, sift together the cake flour, baking powder, and salt. Sifting is crucial for an airy cake.
6. Incorporate Dry into Wet: Gradually add the sifted dry ingredients to the wet egg yolk mixture, whisking gently until just combined and no lumps of flour remain. Be careful not to overmix at this stage; overmixing can develop gluten and lead to a tough cake.
7. Whip Egg Whites: In a very clean, dry bowl (preferably a metal or glass bowl), beat the egg whites with an electric mixer on medium speed until foamy. Add the cream of tartar (if using) and gradually add the remaining 1/2 cup (100g) of granulated sugar, one tablespoon at a time, while continuing to beat. Increase the speed to high and beat until stiff, glossy peaks form. The meringue should be firm and hold its shape when the whisk is lifted.
8. Lighten the Batter: Take about one-third of the whipped egg whites and gently fold them into the egg yolk batter. This step helps to lighten the batter and make it easier to incorporate the remaining egg whites without deflating them.
9. Fold in Remaining Egg Whites: Add the remaining whipped egg whites to the batter. Using a rubber spatula, carefully fold the egg whites into the batter using a gentle, sweeping motion, turning the bowl as you go. Be very gentle and try not to deflate the egg whites. Stop folding as soon as no streaks of white remain.
10. Pour into Pan: Pour the batter into the prepared cake pan. Gently tap the pan on the counter a few times to release any large air bubbles.
11. Bake: Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean and the top springs back when lightly touched. The cake should be golden brown.
12. Cool the Cake: Once baked, immediately invert the cake pan onto a wire rack (you can rest it on bottle necks or elevated surfaces if your pan doesn’t have feet) and let it cool completely upside down. This prevents the cake from collapsing and helps maintain its height and airy texture.
13. Serve: Once completely cool, carefully run a knife around the edges of the pan, invert the cake onto a plate, and then flip it back onto a serving platter. Slice and serve!

Cooking Tips and Variation

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