Macaroni and Cheese with Cauliflower

Ingredients (12)

• ✓ 1 (16 ounce) package elbow macaroni
• + 1 head cauliflower, roughly chopped add to pantry
• + 1 tablespoon olive oil add to pantry
• + 1 onion, finely chopped add to pantry
• + kosher salt add to pantry
• ✓ ½ teaspoon ground black pepper
• + 1 (8 ounce) package grated sharp Cheddar cheese add to pantry
• + 1 ½ cups reduced-fat sour cream add to pantry
• + ½ cup 1% milk add to pantry
• + 1 tablespoon Dijon mustard add to pantry
• + 1 cup bread crumbs add to pantry
• + ½ cup chopped fresh flat-leaf parsley add to pantry