Au Gratin Potatoes - Weight Watchers 4 Points Recipe - (4.5/5)

Ingredients

• 1 spray cooking spray
• 1 tablespoon salted butter
• 1 medium uncooked onion, thinly sliced
• 2 tablespoons all-purpose flour
• 2 cups fat-free skim milk
• 2 pound uncooked yukon gold potato(es), thinly sliced
• 1 cup low-fat Cheddar cheese, shredded
• 1 teaspoon table salt
• 1/4 teaspoon black pepper