Rutabaga Gratin

Ingredients

• Cooking spray
• 1 cup vertically sliced onion
• 1/4 cup all-purpose flour
• 2 cups 1% low-fat milk
• 1/2 cup (2 ounces) shredded Swiss cheese
• 1/2 tsp dried rubbed sage
• 1/4 tsp garlic powder
• 1/8 tsp salt
• 1/8 tsp pepper
• 2 (15-ounce) cans diced rutabagas, drained
• 1/3 cup dry breadcrumbs