Smoky chipotle peppers make this scalloped potato casserole memorable.
Cook sweet potatoes in boiling water to cover 20 minutes or until barely tender. Drain and let cool slightly. Peel potatoes, and cut crosswise into 1/2" slices. Layer potatoes in a lightly greased 13" x 9" baking dish or oval gratin dish.
Melt butter in a saucepan over medium heat; add onion and garlic, and sauté until tender. Sprinkle flour over onion mixture; cook 1 minute, stirring constantly. Gradually add half-and-half, stirring constantly until thickened and bubbly. Stir in salt, cumin, and pepper. Add cheese and chipotle peppers, stirring until cheese melts.
Pour cheese sauce over potatoes. Bake, uncovered, at 350° for 45 minutes or until lightly browned and bubbly. Let stand 15 minutes before serving.
Christmas with Southern Living 2004