Ingredients
Equipment
Method
Prep the potatoes and oven
- Preheat oven to 375°F and brush a 9×13-inch baking dish with 1 teaspoon melted butter; peel and slice sweet potatoes 1/8–3/16 inch thick with a mandoline or sharp knife.
Make the chipotle-gouda sauce
- Warm 1 1/2 cups whole milk in a small saucepan until steaming but not boiling; in a separate saucepan melt 2 tablespoons butter over medium heat, whisk in 2 tablespoons flour and cook 1–1 1/2 minutes, then whisk in warm milk slowly until smooth and simmer 2–3 minutes until slightly thickened.
- Remove sauce from heat and stir in 3/4–1 tablespoon chipotle chile sauce, 1/2 teaspoon kosher salt, 1/4 teaspoon pepper, 1/4 teaspoon cumin, then stir in 1 cup grated smoked gouda until melted; reserve 1/4 cup cheese for topping.
Assemble
- Arrange a single overlapping layer of sweet potato slices in the prepared dish, spoon one-third of the sauce over them and spread gently; repeat two more times so you have three layers, pour any remaining sauce on top and sprinkle reserved cheese.
Bake
- Tent loosely with foil and bake at 375°F for 35 minutes, remove foil and bake another 12–18 minutes until bubbling and top is lightly browned, then let rest 10 minutes before serving.
Finish and serve
- Optional: sprinkle chopped parsley and pecans over the top before serving for color and crunch.
Notes
Warm the milk before adding to the roux for a lump-free sauce. For gluten-free, replace the roux with a cornstarch slurry (2 tbsp cornstarch mixed with cold milk). Grate cheese from a block for best melt; pre-shredded cheese can be grainy. Let the casserole rest 10 minutes to firm before slicing.
