In large microwave-safe bowl combine butter and peanut butter Microwave at High 100 2 to 2 12 minutes or until butter is melted and mixture is smooth when stirred
Stir in sugar and vanilla
Add eggs one at a time beating well with wooden spoon after each addition
Add cocoa beat until well blended
Add flour baking powder and salt beat well
Spread batter into prepared pan
Bake 10 minutes
Sprinkle baking bits over surface Bake additional 20 to 25 minutes or until brownies just begin to pull away from sides of pan