Preheat oven to 375*. Combine butter, sugar, vanilla, and eggs. Mix flour, powder, soda, salt. Slowly add to mixture. Add sour cream, and some milk if the mixture seems too dry. In muffin tin layer: 1 tablespoon batter, 1 teaspoon topping, 1 tablespoon batter, 1 teaspoon topping. Cook for 15-20 minutes. Enjoy!