Peanut Butter & Jelly Cake

yield: one 6-inch cake

INGREDIENTS

1 cup, plus 2 tablespoons (5-5/8 ounces) all-purpose flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/2 cup (4 ounces) packed light brown sugar
1/2 cup (3-1/2 ounces) granulated sugar
1/2 cup creamy peanut butter
3/4 teaspoon pure vanilla extract
1 large egg, room temperature
4 tablespoons ( 2 ounces) unsalted butter, softened
1/2 cup whole milk, room temperature
Banana-R