Ingredients
Equipment
Method
Par-cook potatoes
- Bring a large pot of lightly salted water to a simmer and add sweet potato slices in batches; simmer 3 minutes until slightly softened then drain and let steam-dry in a colander.
Make sauce
- Melt butter in a large saucepan over medium heat, add diced onion and cook 4 minutes until translucent, stir in garlic for 30 seconds, then whisk in flour and cook 1 minute.
- Slowly whisk in milk and cream and bring to just below a simmer while stirring constantly; remove from heat before adding shredded Gouda and stir until smooth; thin with up to 2 tablespoons reserved potato water or milk if necessary.
- Stir in chipotle chile sauce, kosher salt, and black pepper; taste and adjust heat as needed.
Assemble and bake
- Butter the baking dish and arrange a single layer of sweet potato slices, spoon 1/4 of the sauce over the layer, repeating until used; finish with remaining cheese on top, cover tightly with foil, and bake at 375°F for 25 minutes.
- Remove foil and bake 15–20 minutes more until sauce bubbles at edges and top is lightly browned; let rest 10 minutes before serving.
Notes
Par-cook slices briefly to ensure even doneness; add shredded Gouda off the heat to prevent separation. To make it lighter, use 2% milk and reduce cream; for gluten-free, swap flour for a 1:1 GF blend or use a cornstarch slurry.
