**Ingredients:**
– 4 large russet potatoes, peeled and thinly sliced
– 2 tablespoons butter
– 2 cloves garlic, minced
– 2 cups heavy cream or milk
– 1 cup shredded cheddar cheese
– 1/2 cup grated Parmesan cheese
– Salt and pepper to taste
– 1 teaspoon fresh thyme or 1/2 teaspoon dried thyme (optional)

**Instructions:**
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