1/2 c. butterscotch pieces
1/4 c. butter
3/4 c. flour
1/3 c. firmly packed brown sugar
1 tsp. baking powder
1/4 tsp. salt
1/2 tsp. vanilla
1 egg
1 c. miniature marshmallows
1 c. semi-sweet chocolate pieces
1/4 c. chopped nuts

Melt butterscotch pieces and butter in 3 quart heavy saucepan over medium heat, stirring constantly. Remove from heat; cool to lukewarm. Add flour, sugar, baking powder, salt, vanilla and egg to mixture in saucepan; mix well. Fold remaining 3 ingredients into batter just until combined.

Grease bottom and sides of 9 inch square baking pan. Spread mixture in prepared pan. Bake at 350 degrees for 20-25 minutes. Do Not Overbake. Center will be jiggly but becomes firm upon cooling.