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Cheesy Sweet Potato Gratin

Name: Cheesy Sweet Potato Gratin
Ingredients: 1 tablespoon butter; 800 grams sweet potatoes, peeled and sliced into 2mm rounds; 1 white onion, thinly sliced; 2 garlic cloves, finely chopped; 100 milliliters whole milk; 300 milliliters Heavy cream; 80 grams cheddar, grated; 100 grams parmesan cheese, grated; Sea salt and ground black pepper, to taste

This is comfort food at its cheesiest