1/4 c. butter
1/3 c. peanut butter (optional)
3 c. miniature marshmallows
3 c. Fruity or Cocoa Pebbles cereal

Melt butter and peanut butter in saucepan. Stir frequently. Add marshmallows and cereal. Stir until marshmallows start to melt and stick to cereal. Remove from heat. Press mixture into a buttered 8-inch square pan. Chill 1 hour. Cut into squares. You can double this and spread into a 9x13 pan.