Healthier Green Bean Casserole

side dish

Ingredients

• 1 olive oil nonstick cooking spray
• 1 large onion, cut into 1/2 inch thick sli
• 5 tbsp all purpose flour
• 1 salt and pepper
• 1 1/2 lb green beans
• 1 tbsp margarine
• 1 large shallot, finely chopped
• 10 oz sliced cremini or white mushrooms
• 1 c reduced sodium chicken broth
• 1/2 c low-fat milk

Instructions