Stir Together Peanut Butter, Strawberry Jelly, And Marshmallow Creme Until Just Combined. Spread The Peanut Butter Mixture On 2 Slices Of Bread, And Top With The Remaining 2 Bread Slices. Melt The Butter In A Skillet Over Medium-High Heat, And Fry Sandwiches, Turning Once, Until Golden Brown On Both Sides, About 3 Minutes Per Side. Remove From Heat, Cut In Half, And Serve.