Preheat oven to 375 degrees. Mix soup and 1/2 cup sour cream in 8-inch square baking dish. Add chicken, vegetables and cheese; mix.
Place baking mix in medium bowl. Add remaining 1/4 cup sour cream and milk; stir until stiff dough forms.
Drop by heaping tablespoonfuls into 6 mounds over chicken mixture. Bake 35 minutes or until biscuits are golden brown and chicken mixture is hot and bubbly.
Healthy Living Tip: Save 60 calories and 7 grams of fat per serving by preparing with reduced fat cream of chicken soup, reduced fat or light sour cream, Kraft 2% Milk Shredded Reduced Fat Cheddar Cheese and fat-free milk.