1/2 cup butter or margarine
1/4 cup corn syrup (preferably light)
6 cup mini-marshmallows
1 cup milk chocolate chips
1/2 cup M&M's, Reese's Pieces or more chocolate chips
8 cup Golden Grahams cereal, Cheerios or Cinnamon Toast Crunch)
1-2 tsp vanilla extract

 Butter a 9" x 13" pan and place aside.  Place the cereal in a very large bowl and set aside.

Combine butter, corn syrup, 5 cups of marshmallows, and the chocolate chips in a large microwave safe mixing bowl.  Heat on high for 2-3 minutes, stirring each minute, until melted and smooth.  Add vanilla, stir, and pour over cereal.  Mix quickly until coated, then add remaining cup of marshmallows and additional 1/2 cup of M&M's (or more chips).

Pour into prepared pan, smooth using buttered fingers or back of a spoon.

Cool on counter for an hour or refrigerate.  Cut into 2" squares.  Store in airtight container.  Makes 2 dozen squares.