Cheesy Au Gratin Potatoes

Ingredients

• 4 medium russet potatoes, peeled and sliced into 1/4-inch slices
• 1/2 cup chopped onion
• 1/4 cup margarine
• 1 teaspoon flour
• 1/4 teaspoon salt
• 1 1/2 cups milk
• 2 cups shredded mild cheddar cheese
• Black pepper to taste

Method

1. 1 Preheat oven to 350°F and lightly grease a large casserole dish.
2. 2 Melt margarine in a saucepan and stir in flour to create a roux.
3. 3 Gradually whisk in milk and cook until slightly thickened, then remove from heat.
4. 4 Stir in most of the cheese, salt, and pepper until melted and smooth.
5. 5 Layer potatoes, onion, and sauce in the dish, repeating until all ingredients are used.
6. 6 Bake for one hour until potatoes are tender and top is golden.