Marshmallow Banana Bars

1 1/2 cups all-purpose flour
1 teaspoon baking powder
1/2 cup shortening
1 cup granulated sugar
1 egg
1 teaspoon baking soda, dissolved in 1 tablespoon water
1 teaspoon vanilla extract
1 1/3 cups ripe mashed bananas
1 (7 ounce) jar Marshmallow Crème

Sift together dry ingredients. Cream shortening and sugar. Add egg and beat well. Stir in baking soda mixture and vanilla extract. Add dry ingredients alternately with bananas, beating well after each addition. Spread into a greased 15 x 9-inch jellyroll pan. Bake at 350 degrees F for 25 to 30 minutes.Remove from oven and drop spoonfuls of Marshmallow Crème on bars. Let stand 2 minutes and gently spread over bars. Cool and frost.

Frosting:
Combine 2 cups confectioners sugar, 1 tablespoon butter, 1 tablespoon milk,

1 teaspoon vanilla extract and a few drops of yellow food coloring.