Cook noodles according to pkg directions. Drain. Keep warm.

While noodles are cooking, combine tomato sauce, onion powder, & mushrooms in microwavable dish.

Cover dish loosely with plastic wrap or waxed paper. Microwave on High for 6-8 minutes. Stir mixture halfway through cooking time.

While sauce is cooking, coat large nonstick cooking spray and heat over medium high heat.

Cook chicken in skillet until lightly browned, about 3 to 4 minutes per side. Add sauce to skillet. Add salt & pepper.

Reduce heat to medium & simmer until an instant read thermometer inserted in center of meat registers 180 degrees, about 12-15 minutes.

Serve chicken & sauce over noodles.