Peanut Butter Birthday Cake Recipe - Average Betty

Ingredients

• 2 1/4 cups all-purpose flour
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 3/4 cup smooth peanut butter
• 6 tablespoons (3/4 stick) unsalted butter, softened
• 1/2 cup granulated sugar
• 1/2 cup packed brown sugar
• 3 large eggs
• 1 cup plus 2 tablespoons buttermilk
• 8 ounces cream cheese, softened
• 1/2 cup (1 stick) unsalted butter, softened
• 1/3 cup plus 2 tablespoons smooth peanut butter
• pinch of salt
• 2 cups powdered sugar, sifted
• 2 teaspoons pure vanilla extract.