Chocolate Peanut Butter Cupcakes

Chocolate Cupcakes filled with Peanut Butter Cups
7 ounces milk chocolate3/4 cup butter or margarine1 teaspoon vanilla extract1 1/3 cups granulated sugar4 eggs1 cup all-purpose flour1/2 teaspoon baking powder1/4 teaspoon salt12 mini peanut butter cups
Heat oven to 350 degrees F. Line muffin pan with baking cups.
Melt chocolate and butter together; stir in vanilla extract.
In a separate bowl combine sugar, unbeaten eggs, flour, baking powder and salt. Stir in chocolate mixture. Fill muffin cups half full; place peanut butter cup in center of each and top with remaining batter. Bake for 20 to 25 minutes or until a wooden pick inserted in the center comes out clean.