Cheesy Scalloped Potatoes

8 oz. shredded cheddar cheese
1/4 cup butter, melted
1/4 cup flour
2 cups milk
1 tsp. salt
1/4 tsp. pepper
1/2 tsp. garlic
5 medium potatoes
2 small onions

Blend butter and flour. Add milk and cook, stirring constantly until thickened. Add cheese, salt, pepper, and garlic. Stir until cheese is melted. Pour 1/2 of cheese sauce in baking dish. Slice and arrange potatoes and onions on top of sauce. Pour remaining sauce over top. Bake at 350 for 1 hour or until potatoes are tender.