Au Gratin Potatoes, We need prepare 9 Ingredients And 8 Steps

Ok now sTep by step tutorial Au Gratin Potatoes

You can cook Au Gratin Potatoes by using 9 ingredients and 8 steps. Here is how you achieve Au Gratin Potatoes.

Ingredients of Au Gratin Potatoes

You need to prepare of Russet Potatoes cut apx. 1/4 in thick.
You need to prepare of yellow onion slices into half rings.
You need to prepare of butter.
You need to prepare of salt.
You need to prepare of garlic powder.
Prepare of flower.
You need to prepare of milk.
You need to prepare of small bag shredded triple cheddar cheese.
Prepare of parmesan cheese.

Au Gratin Potatoes step by step

Preheat oven to 400 degrees F and butter a 9×13 glass baking dish..
In a medium-size pot, melt butter over medium heat. Mix in the flour, garlic powder, and salt. Stir constantly for one minute..
Stir in milk. Cook until mixture has thickened..
Stir in cheese all at once, and continue stirring until melted, about 30 to 60 seconds..
Layer 1/2 of the potatoes into bottom of the prepared casserole dish and top with the onion slices. Then pour half the cheese mixture on top..
Repeat step 5 with remaining potatoes, onions, and cheese mixture..
Cover with aluminum foil and place in oven for 1 hour. Remove foil and bake for an additional 30 minutes. (Or longer if you desire a crisper finish.).
Set aside to rest for 15 min then it's ready to serve..

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