– 1 tablespoon butter – 1 medium onion, sliced – 2 cloves garlic, crushed – 2 pounds potatoe – 1 cup heavy cream – ⅔ cup milk – 1 ½ teaspoons Dijon mustard – Salt and black pepper, to taste – 6 ounces thick-cut smoked ham, diced – 1 cup grated Gruyère cheese
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