Two Potato Gratin - cooking recipe

Ingredients

1 tablespoon butter
1 cup whole milk or 1 cup 2% low-fat milk
3/4 teaspoon salt
1/8 teaspoon fresh ground pepper
1 pinch dried ancho chile powder
1 pinch of grated nutmeg
1 lb yukon gold potato, peeled, and sliced into 1/2 inch thick rounds
1 lb sweet potato, peeled and sliced into 1/2 inch thick rounds
3 tablespoons whole grain mustard
1 cup shredded gruyere cheese

Preparation

Preheat oven to 400 degrees. Butter a shallow 2-quart gratin pan or ceramic baking dish.
In a large saucepan, combine milk, salt, pepper, chili powder, and nutmeg.
Heat to a boil over medium high heat.
Add potatoes and return to boil, simmering a few minutes, until mixture thickens slightly.
Remove pan from heat; stir in mustard.
With a slotted spoon, transfer half the potatoes to gratin dish; place in an even layer, Sprinkle with 1/2 cup of Gruyere.
Top with remaining potatoes; pour milk mixture over potatoes and sprinkle with remaining 1/2 cup Gruyere. Bake 40 minutes until potatoes are tender and the top is golden.