Creamy Pasta with Cauliflower

Ingredients (8)

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