Tags: French, Vegetarian, Entree
4 potatoes
250 grams onion
4 grams salt and pepper
42 grams butter
24 grams flour
500 grams whole milk
180 grams cheddar
Preheat to 400 F. Butter the casserole dish.
Layer half of potatoes into bottom of dish. Top with onions and add remaining potatoes. Season with salt and pepper.
In medium-sized pan, melt butter over medium heat. Mix in flour and salt. Stir constantly with whisk for 1 minute. Stir in milk.
Cook until thickened, then stir in cheese all at once.
Continue stirring until melted, about 30 to 60 seconds. Pour cheese over potatoes and cover with dish with aluminum foil. Bake 90 minutes.