Healthier Creamy Au Gratin Potatoes

Step 1
Preheat oven to 400 degrees F (200 degrees C). Lightly butter a 1-quart baking dish.

Step 2
Layer half the potatoes into the bottom of prepared baking dish. Top with onion slices and add remaining potatoes.

Step 3
Season potatoes with salt and pepper.

Step 4
Melt butter over medium heat in a saucepan. Mix in flour and salt, stirring constantly with a whisk, for one minute. Stir in milk. Cook until mixture has thickened. Add Cheddar cheese and continue stirring until melted, 30 to 60 seconds.

Step 5
Pour cheese sauce over potatoes and cover dish with aluminum foil.

Step 6
Bake in the preheated oven until cheese sauce is bubbling and potatoes are tender, about 1 1/2 hours.