Yellow birthday cake with chocolate frosting

Step 1/4

• 330 g flour
• 15 g starch
• 280 g sugar
• 1 tsp baking powder
• ½ tsp baking soda
• ¼ tsp salt
• 330 g unsalted butter
• 1 tsp vanilla extract
• 240 ml milk
• 80 g sour cream
• 3 eggs

• hand mixer with beaters
• parchment paper
• baking pan (9x13 in.)
• oven
• 2 bowls
• rubber spatula

Preheat the oven to 180°C/355°F. Line a baking pan with parchment paper. Mix flour, cornstarch, sugar, baking powder, baking soda, and salt in a bowl. Using a hand mixer on medium speed, work some of the butter into the flour mixture. Then stir in half the vanilla extract, milk, and sour cream, and mix for about 1 min., or until a smooth batter forms. Add eggs one at a time and mix until combined.

Step 2/4

Transfer batter to the baking pan and bake for approx. 25 min., or until a toothpick inserted into the center of the cake comes out clean. Let cool completely.

Step 3/4

• 60 g unsweetened cocoa powder
• 380 g confectioner’s sugar
• 100 g unsalted butter
• 80 g cream cheese
• 1 tsp vanilla extract

• fine sieve
• 2 bowls

While the cake cools, prepare the frosting. Sift cocoa powder and powdered sugar together into a large bowl. Use a hand mixer with beaters to cream the remaining butter and cream cheese for approx. 2 min. Then add the remaining vanilla extract. Gradually add the cocoa mixture to the cream and beat until light and fluffy.