Cloud Puff Angel Cake

Cloud Puff Angel Cake is a tall, airy sponge cake made entirely from whipped egg whites and no butter or oil. The result is a delicate crumb with a light, almost cloud-like texture that feels indulgent while staying genuinely simple. Success depends on three things: room-temperature egg whites that can reach full volume, cream of tartar to stabilize the foam, and a cool oven that bakes gently without browning.

Ingredients for Cloud Puff Angel Cake

Egg whites are the base of this cake, whipped until stiff peaks hold the entire structure. Cream of tartar helps the whites reach their fullest volume and keeps them from breaking down. Granulated sugar sweetens and stabilizes the foam as it beats in. Cake flour is softer than all-purpose flour, giving the crumb a more tender bite. Vanilla extract adds warmth without heaviness. Salt brightens the flavor and balances the sweetness.

Why This Cloud Puff Angel Cake Works

Angel cake relies on whipped egg whites to trap air and rise in the oven. As the whites beat, they unfold into millions of tiny bubbles that expand with heat. The sugar dissolves into the whites as they whip, creating a stable foam that holds those bubbles even as the cake bakes and the proteins set.

Cake flour has less protein than all-purpose, so when folded into the whites, it doesn’t deflate the foam as much. The result is a cake with an open, tender crumb instead of a dense sponge. The lack of fat means the cake stays light and clean-tasting, with the vanilla and subtle egg flavor coming through clearly.

Angel cake bakes upside down in a tall pan with a removable center tube. This shape lets the batter climb the sides as it rises, and the center tube keeps the inside from baking too fast. Cooling upside down prevents the cake from shrinking as it cools, which would make it dense.

Mistakes To Avoid

Measuring flour by scooping the measuring cup directly into the bag packs the flour tight and adds too much weight to the batter. The cake will turn out dense and squat instead of tall and airy. Always spoon the flour loosely into the cup and level it.

Even a tiny amount of egg yolk in the whites will prevent them from whipping to stiff peaks because fat breaks the protein structure. The cake will not rise properly and will have a gummy, sunken crumb. Separate eggs carefully and discard any white that contains even a speck of yolk.

Over-folding the flour into the whites deflates the foam and loses the airiness the whipping created. The cake will bake up dense and low instead of tall and fluffy. Fold just until no white streaks remain, then stop immediately.

Turning the cake right-side up while it is still warm causes it to shrink and compress as it cools. The top will sink and the crumb will turn rubbery and dense. Always cool the cake completely upside down, then run a thin knife around the edges to loosen it before turning it over.

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Ingredients

• 12 large egg whites, room temperature
• 1 1/2 teaspoons cream of tartar
• 1/2 teaspoon salt
• 1 1/2 cups (300 grams) granulated sugar
• 1 1/2 cups (150 grams) cake flour
• 1 1/2 teaspoons vanilla extract
• 3 tablespoons water

Step-by-step Instructions

1. Heat the oven to 325°F (163°C) and place a rack in the lower third of the oven.
2. In the bowl of an electric mixer, combine the egg whites, cream of tartar, and salt. Beat on medium-high speed until soft peaks form, about 3 to 4 minutes, then gradually add the sugar while beating.
3. Continue beating on medium-high speed until stiff peaks form and the mixture is glossy, about 4 to 5 more minutes. The whites should not slide when you tilt the bowl.
4. In a small bowl, whisk together the cake flour and water to make a thin paste, then add the vanilla.
5. Sift the flour mixture into the whites in two batches, folding gently with a rubber spatula after each addition until no white streaks remain. Turn the bowl as you fold and stop as soon as the mixture looks combined.
6. Pour the batter into an ungreased 10-inch tube cake pan and smooth the top with a spatula.
7. Bake at 325°F (163°C) for 35 to 40 minutes, until a cake tester inserted near the center comes out clean and the top is pale golden and springs back when lightly pressed.
8. Remove the cake from the oven and immediately invert it onto a bottle neck, the stem of a wine glass, or a cake cooler so the opening faces down. Let it cool completely upside down for at least 2 hours.
9. Once cool, run a thin knife around the inside edge of the pan and around the center tube to loosen the cake, then turn it right-side up and remove the pan.
10. Run the knife around the bottom edge to loosen the cake from the removable bottom, then slide it onto a serving plate.