Heat oven to 375°F. Spray 1-quart casserole with cooking spray.
Place biscuits on microwavable plate. Microwave uncovered on Medium (50%) 30 to 45 seconds, turning over halfway through microwave time. Cut the biscuits into quarters. (Biscuits should still be cold for easier handling.)
In 1-quart saucepan, heat pasta sauce, vegetables and chicken to boiling over medium-high heat, stirring frequently. Spoon into casserole. Top evenly with biscuit pieces; sprinkle biscuit pieces with cheese.
Bake 40 to 45 minutes or until chicken mixture is bubbly and biscuits are deep golden brown. Let stand 10 minutes before serving.