• Before starting, preheat the oven to 425°F.
• Wash and dry all produce.
• Bring a large pot of salted water to a boil over high.
• Meanwhile, cut cauliflower into bite-sized pieces.
• Peel, then cut half the onion (use whole onion for 4 servings) into 1/4-inch pieces.
• Pat chicken dry with paper towels. Season with salt and pepper. Arrange on an unlined baking sheet. Drizzle 1 tbsp (2 tbsp) oil over top. Roast in the bottom of the oven for 18-22 min, until golden and cooked through.**

• To an unlined baking sheet, add cauliflower and 1 tbsp (2 tbsp) oil.
• Season with half the garlic salt and pepper, then toss to coat.
• Roast in the middle of the oven for 14-16 min, until browned.

• Meanwhile, to the boiling water, add rigatoni.
• Cook for 12-13 min, stirring occasionally, until tender but still firm to the bite.
• Reserve 1/2 cup (1 cup) pasta water. Strain rigatoni, then return to the pot, off heat.

• Heat a large non-stick pan over medium.
• When hot, add 1 tbsp (2 tbsp) butter, then onions. Cook for 3-4 min, stirring often, until softened.
• Sprinkle flour and remaining garlic salt over onions.
• Cook for 1 min, stirring often, until onions are coated.
• Add cream and 1/2 cup (1 cup) milk, then bring to a boil.
• Once boiling, cook for 1 min, stirring often, until sauce thickens.
• Remove from heat, then add spinach. Stir for 1 min, until wilted.

• To the pot with rigatoni, add cheese, creamy sauce, cauliflower and half the reserved pasta. 
• Stir for 1 min, until cheese melts. (TIP: For a lighter sauce consistency, add more reserved pasta water, 1-2 tbsp at a time.)
• Season with salt and pepper.

• Divide cheesy creamy cauliflower pasta between bowls.
• Thinly slice chicken. Top bowls with chicken.
• Sprinkle chili flakes over top, if you like.

If you've opted to add chicken breasts, pat dry with paper towels. Season with salt and pepper. Arrange on an unlined baking sheet. Drizzle 1 tbsp (2 tbsp) oil over top. Roast in the bottom of the oven for 18-22 min, until golden and cooked through. **

Thinly slice chicken. Top bowls with chicken.