Creamy Pasta with Cauliflower

Ingredients (8 items)

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• 1 medium head cauliflower, broken into small florets
• ½ cup salted butter
• 1 medium onion, diced
• 1 tablespoon red pepper flakes, or to taste
• 2 pints heavy cream
• 1 (16 ounce) package farfalle pasta
• 1 (14.5 ounce) can diced tomatoes
• 1 cup grated Parmesan cheese, or more to taste