Chocolate Cupcakes Filled with Peanut Butter Cups

7 ounces milk chocolate
3/4 cup butter or margarine
1 teaspoon vanilla extract
1 1/3 cups granulated sugar
4 eggs
1 cup all-purpose flour
1/2 teaspoon baking powder
1/4 teaspoon salt
12 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.