Mega Brownie Cups

Heat oven to 350°F (175°C). Line 18 muffin cups with paper baking cups. In large microwave-safe bowl, place butter. Microwave at HIGH (100%) 1 to 1 1/2 minutes or until melted. Stir in sugar and vanilla. Add eggs, one at a time, beating well with spoon after each addition. Add cocoa; beat until well blended. Add flour, baking powder and salt; beat well. Remove 1 1/4 cups batter; set aside. Divide remaining batter evenly into muffin cups. Place one chocolate in center of each cup. (Do not push down into batter.) Place slightly rounded tablespoon reserved batter on top of each chocolate. Bake 18 to 20 minutes or until surface is set. Cool completely in pan on wire rack.