Get ready for your family to devour these Cheesy Au Gratin Potatoes. They are cheesy, creamy, yummy potatoes. They will instantly become a family favorite.
Prep Time:15 minutes
Cook Time:90 minutes
Total Time:1 hour 45 minutes
Yield:6-8 servings 1x
4 large russet potatoes, washed, peeled and sliced thin. (These can be sliced by hand but if you have a mandolin you can get a much more consistent slice.)
1/2 large onion, peeled and sliced into thin rings (same size as the potatoes)
3 TBS flour
3 TBS butter
2 cups of milk
2 cups of shredded sharp cheddar cheese
1 teaspoon dry mustard
1/2 teaspoon ground sage
1/4 teaspoon nutmeg
Salt and Pepper to taste
Preheat oven to 400 degrees.
Spray a large casserole dish with non-stick cooking spray.
Start with potatoes and place a layer covering the bottom of the dish, next layer with onions, again with a layer of potatoes and continue until all onions and potatoes are in the casserole dish. Set aside.
In a saucepan on the stovetop, melt butter on medium, add flour and whisk, about 2 minutes, add milk and continue whisking constantly until the mixture begins to thicken (this may take 3-5 minutes).
Add dry mustard, ground sage, and nutmeg.
Add the cheese and once the cheese is fully incorporated, remove from heat.
Pour the cheese mixture over the potato/onion layers.
Cover with foil and bake for 1.5 hours.
Remove from oven, remove foil, and place it back into the oven on broil until they brown.