Peanut Butter and Jam Bars

Heat oven to 350 degrees. Mix sugars, shortening, peanut butter, and egg. Stir in flour, baking soda, and baking powder. Reserve 1 cup of the dough. Press remaining dough in ungreased rectangular pan, 13x9x2 inches; spread with jam. Mix reserved dough with extra flour to make more crumbly; crumble and sprinkle over jam. Bake until golden brown, about 20 minutes. Cool; drizzle with Glaze. Cut into bars, about 2 x 1 ½ inches. For glaze, Heat butter in a 1 quart saucepan over low heat until melted. Mix in powdered sugar and vanilla. Beat in hot water, 1 teaspoon at a time, until smooth and of desired consistency.