Mom's Sponge Cake Recipe

Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9x13-inch baking pan.

Beat eggs in a stand mixer fitted with the whisk attachment on high speed until thick and lemon-colored about 3 minutes. Gradually add sugar beating until mixture is thick about 5 minutes. Fold flour baking powder and salt into the batter by hand.

Microwave milk in a small microwave-safe bowl until it begins to bubble about 1 minute. Stir in butter until melted. Add vanilla extract.

Pour milk mixture into the batter; blend on low speed until well-combined and smooth. Pour into the prepared pan.

Bake in the preheated oven until a toothpick inserted in the center comes out clean 25 to 30 minutes.