In a mixing bowl, cream butter and sugar; beat in egg until light and fluffy. Combine flour, baking powder and salt. In another bowl, combine buttermilk and vanilla. Add dry ingredients to the creamed mixture alternately with buttermilk mixture; mix well. Fold in marshmallows and chips. Pour into greased and floured (or Pam sprayed) 9 x 13 baking pan. Combine topping ingredients; sprinkle over batter. Bake at 350 degrees for 30-35 minutes or until a toothpick inserted near the center comes out clean.
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