Potatoes Au Gratin 

INGREDIENTS

2 ½ pounds red potatoes


½ cup chopped broccoli 


1 onion


3 tablespoons butter


3 tablespoons flour


1 teaspoon dry mustard


2 cups milk


1 cup cheddar cheese shredded
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½ cup gruyere cheese shredded


Diamond Crystal Salt Co.^™ Kosher Salt & pepper to taste


DIRECTIONS

1. Preheat oven to 400°F. 
2. Wash potatoes and slice into ⅛" thin slices. Slice onion as thin as possible. Layer the potatoes and onions in little stacks. Place stacks upright in a greased casserole 2.5qt to 3qt dish.

3. Melt butter & flour in a saucepan and cook for 2-3 minutes. Add seasonings and milk. Whisk over medium heat until thick and bubbly. Remove from heat and stir in cheeses until melted. 
4. Spoon cheese sauce over potatoes. Cover with foil (sprayed with cooking spray) and bake 60 minutes.

5. Remove foil and bake an additional 20-30 minutes or until lightly browned and potatoes are cooked. 
6. Cool 15 minutes before serving.