Preheat oven to 375 degrees.
In a bowl, cream butter, peanut butter and sugars. Beat in egg and vanilla. Stir in flour until blended.
Spread dough onto a greased 12-inch pizza pan; bake for 12 minutes. Sprinkle with marshmallows and chocolate chips. Bake 5-6 minutes longer or until lightly browned.
Bake
2011