Prepare bottom crust by cutting 2 Tablespoons cold butter into 1 cup Bisquick until mixture resembles fine crumbs.
Stir in milk (about 2 Tablespoons) until mixture begins to form a ball and cleans side of bowl.
Pat on bottom and up to rim of ungreased pie plate, 9x1 1/4 inches. Bake 5 minutes.
Heat remaining butter (1/4 cup) in 2-quart saucepan until melted; stir in 1/4 cup baking mix, the onion and pepper.
Cook, stirring constantly, until mixture is bubbly; remove from heat. Stir in chicken broth; add vegetables. Heat to boiling, stirring constantly. Boil and stir 1 minute. Stir in chicken; heat through.
Pour chicken mixture into bottom crust.
Mix 1/2 cup Bisquick, 1/3 cup milk and 1 Tablespoon melted butter until smooth. Pour evenly over chicken mixture; spread gently to edge.
Bake 25 minutes or until golden brown. Let stand 10 minutes before serving.
Nutrition Info Per Serving: Calories 480 Total Fat 34 g Cholesterol 111 mg Sodium 482 mg Potassium 215 mg Total Carbohydrate 29 g Dietary Fiber 2 g Sugars 2 g Protein 14 g