Nonstick cooking spray
2 cups all-purpose flour
1 1/2 teaspoons baking powder
3/4 teaspoon baking soda
1/2 teaspoon fine salt
1 cup buttermilk
1/4 cup vegetable oil
1 1/2 teaspoons vanilla extract
3 large eggs
1 3/4 cups sugar
1 1/2 cups smooth peanut butter, warmed
2 cups milk chocolate chips