4largepotatoes,peeled, washed and sliced into ¼-inch thick rounds
Instructions
Preheat the oven to 350°F. Spray a 9x13 inch casserole dish (or something similar) with nonstick spray.
In a medium saucepan, sauté the mushrooms and onion in oil. Stir over medium heat until tender, about 5 minutes.
Sprinkle the flour over the vegetables. Stir until the vegetables are coated with flour. Then, gradually stir in the milk. Cook until the mixture is thick and bubbly, about 5 to 6 minutes, stirring often.
Add the dill, Worcestershire sauce, salt, pepper and cheese. Cook 1 more minute, until the cheese is melted. Remove from heat.
Spread ⅓ of the potatoes over the bottom of the prepared casserole dish, followed by ⅓ cheese sauce. Repeat the layering 2 more times. Cover and bake 1½ hours. Remove from the oven and let stand for about 15 minutes before serving.