1 (10 oz.) bag (about 40) regular marshmallows or 4 c. mini marshmallows
1/3 c. peanut butter
1 1/2 c. raisins, chocolate chips or nuts (optional)
1/4 c. butter
7 1/2 c. or 1 (10 oz.) box Kellogg's Frosted Flakes cereal
1 tsp. butter flavoring

In a 4-quart microwavable bowl melt marshmallows on microwave high for 3 minutes, stirring after 1 1/2 minutes. Add peanut butter and stir until mixture is smooth. Add Frosted Flakes, stirring carefully to coat all pieces. Add optional items at this time if desired.

Using buttered spatula or waxed paper, press mixture into a lightly greased 9x13x2-inch pan. Cut into bars. (Use fresh marshmallows for best results.)