Classic Scalloped Potatoes au Gratin

Ingredients

• 4 large potatoes, peeled and thinly sliced
• 1 small onion, finely chopped
• 2 cups shredded cheddar cheese
• 2 cups milk
• 4 tablespoons butter
• 2 tablespoons all-purpose flour
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 1/2 teaspoon garlic powder
• 1/2 teaspoon paprika