"To prep ahead, place ingredients in dish; let cool. Cover and refrigerate, up to 2 days. Let sit at room temperature 2 hours, then bake...."
INGREDIENTS
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1 tablespoon unsalted butter, plus more for dish
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1 1/2 pounds Yukon Gold potatoes (about 6 medium), peeled and sliced 1/2 inch thick
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Salt and pepper
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1 small head cauliflower (about 2 pounds), sliced 1/2 inch thick
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1 tablespoon fresh thyme leaves
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1 1/2 cups shredded sharp cheddar (6 ounces)
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1/3 cup chicken broth