Preheat oven to 400 degrees F. For filling, combine onion and mushrooms in microwave safe bowl. Cover; microwave on high 2 minutes or until softened, stirring halfway through cooking time. Add chicken, peas and carrots, soup and pepper to onion mixture; mix well.
Pour into greased 9 inch square baking pan. Bake 10-15 minutes or until bubbling around edges. Meanwhile, prepare topping. In medium bowl, combine flour, baking powder and salt. In small bowl, combine egg, milk and oil. Add to dry ingredients; stir until just moistened.
Remove baking pan from oven; place on wire rack. Drop tablespoons of topping evenly over chicken mixture. Bake 25-30 minutes longer or until topping is golden brown.
By Robin from Washington, IA
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