Ingredients
3 pounds potatoes, thinly sliced
½ onion chopped up
9 tablespoons all-purpose flour, divided
6 tablespoons butter, diced and divided
salt and ground black pepper to taste
3 cups milk
1/4 cup Le Gruyere Cheese shredded
Paprika
Directions
Preheat oven to 375 degrees F
Grease a 9×13-inch baking dish.
Spread about 1/3 of the potato slices into the bottom of the prepared baking dish. Top with about 1/3 of the onion slices. Sprinkle 3 tablespoons flour over the potato and onion. Arrange 2 tablespoons butter on top of the flour. Season the entire layer with salt and pepper. Repeat layering twice more
Heat milk in microwave 60 seconds until warm. Pour enough warm milk over the mixture in the baking dish so the top of the liquid is level with the final layer of potatoes
Spread the Le Gruyere Cheese all over top
Sprinkle some paprika over the top if desired
Bake in preheated oven until potatoes are tender, 45 to 60 minutes.