Make this recipe a recipe that people in that category can eat. categories: ['low_sodium'], 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: layer potatoes, flour, milk, and salt and pepper (if desired) in a large casserole dish in several layers, then top with cheeses and paprika. bake at 350°f for 1 1/2 hours. optional crockpot method: spray crock pot with non-stick spray. layer ingredients in crockpot as directed for oven method. cook on high about 5 hours, until potatoes are tender. all cooking times are approximate. preparation time allows for peeling and slicing potatoes. cooking time is for oven method.