Step 1

Preheat oven to 350º. Lightly butter a 2 quart casserole dish.

Step 2

In a large skillet over medium heat, cook the sausage. Remove and place on a paper towel lined plate.

Step 3

In the same skillet, melt the butter over medium heat and add onions. Cook for about 5 minutes until softened and slightly brown. Whisk in flour cooking for about 1 minute. Slowly add milk, whisking constantly. Once thickened, remove from heat and add 1 cup of the cheese. Salt and pepper to taste.

Step 4

In a buttered casserole dish, add half of the sliced potatoes, spoon over half of the sauce and sprinkle with half of the sausage. Repeat and cover with aluminum foil.

Step 5

Bake for 60 minutes or until the potatoes are soft but not mushy. Remove foil and top with 1 cup of cheese. Return to the oven for 3-4 minutes until the cheese melts.