This Potatoes Au Gratin recipe is made with a cheesy creamy sauce, golden and sweet potatoes that are thinly sliced, diced onion, and savory crisp bacon!
In a large saucepan, cook onion and garlic in hot butter until tender. Whisk in salt and pepper and flour. Add in milk, continuing to whisk until sauce is thickened, hot and bubbly.
Spread one-third of the sauce into the bottom of the prepared casserole dish. Top with half of both the gold and the sweet potatoes, then half of the Asiago cheese.
Top with another third of the sauce, then the remaining potatoes, and the remaining Asiago cheese. Spoon the remainder of the sauce over the top. Sprinkle with the parmesan cheese.
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