1Heat oven to 400°F. Spray 9-inch glass pie plate with cooking spray. Layer chicken, corn and 3 tablespoons of the parsley in pie plate.
2In medium bowl, stir Bisquick mix, milk, 1/4 cup barbecue sauce and eggs with wire whisk or fork until blended. Pour into pie plate.
3Bake 28 to 32 minutes or until knife inserted in center comes out clean. Brush 2 tablespoons barbecue sauce over top of pie. Sprinkle onions evenly over sauce.
4Bake 2 to 3 minutes longer or until onions are golden brown. Remove from oven; sprinkle with remaining 1 tablespoon parsley. Serve with additional barbecue sauce.