Easy Scalloped Potatoes

 Ingredients

3 pounds potatoes, thinly sliced

½ onion, thinly sliced

9 tablespoons all-purpose flour, divided

6 tablespoons butter, diced and divided

salt and ground black pepper(optional)to taste

3 cups whole milk, or as needed

Directions

Preheat oven to 375 degrees F (190 degrees C).(350 degrees F if using convection oven)

Grease a 9x13-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 atop the flour. Season the entire layer with salt and pepper(optional).

Repeat layering twice more.

Heat milk in a saucepan or in the microwave 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.

Bake in the preheated oven until potatoes are tender, 45 to 60 minutes. Serve hot and enjoy!