Make this recipe a recipe that people in that category can eat. categories: ['low_sugar'], recipe: sauce: in saucepan, melt butter over medium heat; cook flour, salt, rosemary and pepper, stirring, for 1 minute. gradually whisk in milk; cook, whisking constantly, until boiling and thickened, 12 to 15 minutes. set aside. peel and thinly slice yukon gold and sweet potatoes. layer half of the yukon gold potatoes in greased 13- x 9-inch (3 l) glass baking dish; spread with half of the onion. layer with sweet potatoes then remaining onion and yukon gold potatoes. pour sauce over top. cover with greased foil; bake in 350°f (180°c) oven for 1 hour. sprinkle with parmesan cheese; bake, uncovered, until lightly browned and tender, about 30 minutes. let stand for 10 minutes before serving.

Target recipe: preheat oven to 325°f. spray a medium sized casserole with cooking spray. layer casserole with potatoes, onions, cheese, and a sprinkling of chives; season layer with salt and pepper to taste, and dot with butter. repeat layers until all ingredients are used. pour milk over layers. bake, covered with a lid or foil at 325f for 45 minutes; uncover and bake 30-35 minutes further or until potatoes are tender, and top is golden. note: if you have difficulty browning top, place under broiler for a minute or so.