Homemade Potatoes Au Gratin includes layers of thinly sliced potatoes baked in a creamy cheese sauce. It's luxurious, but easy to make, and a French classic.
Peel the potatoes if you'd like. Slice the potatoes into very thin 1/8'' slices.
In a small saucepan over medium heat, melt butter and stir in flour until smooth. Cook 1-2 minutes, stirring constantly.
Slowly stir in the milk, cream, minced garlic, dried onions, and season with salt and pepper. Cook sauce on low until smooth and boiling, stirring occasionally with a whisk.
Reduce heat and stir in 2 cups of shredded cheese until melted and smooth. Taste sauce and add additional salt, pepper, garlic or onion flakes, if desired.
Place half of the sliced potatoes in a lightly greased 9x13 inch casserole dish. Pour half of the cheese sauce over potatoes.
Layer the remaining potatoes on top. Spoon the remaining cheese sauce over the potatoes. Sprinkle remaining cheese on top.
Cover with aluminum foil and bake at 350 degrees F for 30 minutes.
Remove foil and continue baking, uncovered, for an additional 30 minutes, or until potatoes are cooked, cheese is browned, and sauce is bubbly.
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Notes
Make Ahead Instructions: Prepare up until baking. Cover with tinfoil and refrigerate overnight. Remove from fridge 30 minutes before baking.Crock Pot Au Gratin Potatoes: Spray the bottom of the slow cooker with non-stick cooking spray. Layer the potatoes and cheese in the instant pot the same way you would in a casserole dish. Apply lid and slow cook on high for 3 hours, or until potatoes are tender.Ham and Potatoes Au Gratin: Add 1 1/2 cups chopped ham on top of the potatoes, before adding cheese sauce.