Cook the Pasta: Bring a large pot of salted water to a boil over high heat, add your pasta, and cook according to package instructions for 8-10 minutes. Drain and set aside.

Sauté the Sausage: In a large skillet, heat olive oil over medium-high heat. Cook the sliced sausage for about 5 minutes until browned and crispy.

Add the Garlic: Reduce heat to medium-low, add minced garlic, and sauté for about 30-60 seconds until fragrant.

Combine the Sauce Ingredients: Stir in marinara sauce and heavy cream, season with red pepper flakes, salt, and pepper. Let simmer for 2-3 minutes.

Incorporate Fresh Spinach: Add spinach to the skillet and turn off heat. Stir to combine until wilted.

Combine Pasta and Sauce: Add the drained pasta into the skillet and toss until fully coated with sauce.

Serve with Garnishes: Plate and garnish with Parmesan cheese and parsley or basil. Serve hot.