So good, and all ingredients you probably already have at home!
4 large russet potatoes, sliced thin.(I peeled mine)
1/2-1 onion, sliced thin into rings
salt and pepper
1/2 tsp salt
2 cups milk
1-2 cups shredded cheddar or cheese of your liking
Preheat oven to 400. Grease 1 1/2qt dish. Layer 1/2 the potato slices on bottom of dish. Top with onion slices, season with salt and pepper (I added garlic salt too) and dot with 1T butter if you like. Add remaining potatoes and season again. In saucepan, melt butter over medium heat. Mix in flour and salt and stir constantly 1 minute. Add milk and cook till thickened. Stir in cheese till melted. Pour over potatoes, and cover with foil. (I added a crunchy topping made of corn flakes and butter and it rocked). Bake 1 1/2 hrs. Serves family of 6.