Here's the recipe I used
3 tablespoons of butter
1 package (10 oz, about 40) regular marshmallows or
5 cups miniature marshmallows (this has more marshmallows then that other famous marshmallow treats recipe but I always add more marshmallow. You'll find they taste even better)
3 cups Chocolate Cheerios
3 cups Peanut Butter Cheerios
In a large sauce pan, melt butter over low heat. Add marshmallows and stir until completely melted. Remove from Heat.
Add the both the Chocolate Cheerios and the Peanut Butter Cheerios and stir until well coated.
Using a buttered spatula or wax paper, evenly press mixture into a 13x9x2 pan coated with cooking spray or butter. Cool.
Cut into 2 inch squares. Best if eaten the same day. (But I don't think you'll have any leftovers)