Follow these steps to bring this family-favorite casserole to life:

1. Preheat your oven to 400°F (200°C).
2. Toss the cauliflower florets with olive oil, salt, and pepper. Spread them on a baking sheet and roast in the oven for about 20 minutes until golden and slightly tender.
3. In a large skillet, cook the Italian sausage over medium heat until browned. Remove the sausage from the skillet and set aside.
4. In the same skillet, add the chopped onion and garlic, sautéing until softened and fragrant.
5. Stir in the crushed tomatoes, basil, oregano, salt, and pepper, simmering for about 10 minutes to let the flavors meld.
6. Combine the roasted cauliflower and sausage into the tomato mixture, stirring until well coated.
7. Transfer the mixture into a casserole dish. Top with shredded mozzarella and Parmesan cheese.
8. Bake in the oven for 20-25 minutes until the cheese is melted and bubbly.
9. Let it cool slightly before serving, allowing the flavors to settle.

As you prepare this dish, let the aroma transport you to a cozy kitchen filled with love and laughter, much like those afternoons spent with Mama Lou and Ouma, where cooking was more than just a task; it was a way of bringing us all together.