1. Bring a large pot of salted water to a boil and cook spaghetti until al dente. Drain and set aside.

2. In a large skillet over medium-high heat, brown the sausage, breaking it apart as it cooks. Set aside.

3. Reduce heat to medium. In the same skillet, melt the butter and add minced garlic. Sauté until fragrant.

4. Pour in heavy cream. Simmer, then stir in parmesan and mozzarella until the sauce is smooth.

5. Add fresh spinach and stir until wilted, about 2–3 minutes.

6. Return sausage to the skillet and toss in the cooked spaghetti. Mix to coat evenly.

7. Season with salt, pepper, and red pepper flakes. Serve hot with extra parmesan if desired.