Rice Crispie Squares

• 1/4 cup butter
• 1 pack marshmallows
• 5 1/2 cups Rice Crispies
• 1/2 tsp vanilla

Melt butter, add marshmallows and cook over low heat, stirring constantly until melted. Remove from heat, add vanilla and Rice Crispies. Press into lightly greased 9 x 13 inch pan. Cool