For the Peanut Butter Cake:
- 2 ¼ cup cake flour
- 2 teaspoons baking powder
- ¾ teaspoon salt
- ½ teaspoon cinnamon
- ½ cup unsalted butter, softened
- ½ cup peanut butter
- 1 ½ cups granulated sugar
- 2 eggs
- ⅔ cup milk
- 2 teaspoons vanilla extract
For the Brown Sugar Peanut Butter Frosting:
- ¾ cup brown sugar (firmly packed)
- 3 egg whites
- 1 ½ cups unsalted butter, softened
- 1 teaspoon vanilla extract
- 6 tablespoons creamy peanut butter
For the Assembly:
- seedless strawberry jelly
- chopped peanuts, optional