Caramel Apple Pecan Layer Cake

CAKE LAYERS

• 3/4 cup (168g) unsalted butter, room temperature
• 1 1/2 cups (310g) sugar
• 3/4 cup (173g) sour cream
• 1 tsp vanilla extract
• 6 large egg whites, room temperature
• 2 1/2 cups (325g) all-purpose flour
• 4 tsp (15g) baking powder…