Preheat oven to 350°F
Chop celery
Chop carrots
Chop onion
Cut sausage into 1/4" pieces
Prepare rice mixes according to package directions
Preheat oil in skillet over medium-high heat
Add sausage, celery, carrots, and onion to preheated skillet
Cook sausage mixture in skillet for 5 minutes
Combine sausage mixture, rice, soup, onion powder, garlic powder, and pepper in mixing bowl
Spray casserole dish with cooking spray
Pour mixture into casserole dish
Cover casserole dish with foil
Bake for 45 minutes in preheated oven
Serve