Easy Au Gratin Potatoes Recipe

Ingredients

• 6 - 8+ potatoes (depending on the size of your dish and potatoes)
• 4 tablespoons butter (¼ stick butter)
• 1 onion
• 4 tablespoons ¼ cup all-purpose flour
• 2 cups milk
• 2½ cups cheddar cheese (or gruyere cheese, Mexican cheese blend, etc.)
• 1½ teaspoons salt
• ¼ teaspoon pepper
• Vegetable oil or butter to coat casserole dish