Buffet Carrots

Ingredients

• 1 small onion, diced
• 1/4 c. flour
• 1/4 tsp. dry mustard
• 1/4 tsp. celery salt
• 12 to 15 carrots, sliced
• 1 1/2 c. stuffing mix
• 1 c. butter or margarine
• 1 tsp. salt
• 1/8 tsp. pepper
• 2 c. milk
• 1/2 lb. grated sharp Cheddar cheese