Ranch Au Gratin Potatoes

3-4 lbs thinly sliced potatoes

1/2 c butter

1/2 c flour

3-4 cups milk

1 pkt (3 Tbs) ranch dip mix

1/3 cup parmesan cheese

1/2 cup sour cream

salt to taste

Melt butter in sauce pan. Add flour, making a roux. Add milk and heat until thickened, want sauce a little bit thicker than gravy. Add ranch mix, parmesan, and sour cream. Add salt to taste.

Place thinly sliced potatoes in a 9X13 pan layer with sauce (similar to making lasagna: a layer of potatoes, a layer of sauce, repeat...)

Sprinkle top of casserole with parmesan cheese. cover with aluminum foil. Bake at 400 for 45 minutes or until potatoes are cooked through. Remove foil for last 15 minutes of baking.