1/2 c. butter, softened
3/4 c. firmly packed light brown sugar
1 egg
1 1/4 c. all-purpose flour
1/2 tsp. baking soda
1 c. miniature marshmallows
3/4 c. candy coated chocolate pieces (M & M's)
3/4 c. peanut candy coated chocolate pieces (M & M's)

Preheat oven to 350 degrees. Grease 12" pizza pan or skillet. In medium bowl with electric mixer at medium, cream butter and sugar until light and fluffy, about 1 minute. Beat in egg. At low, stir in flour and baking soda until well blended. Evenly spread dough into prepared pan. Bake 20 minutes or until lightly browned; sprinkle marshmallows and candies on cookie during last 5 minutes of baking. Cool 10 minutes in pan on wire rack. To serve, cut cookie into 16 wedges.