Step 1

Heat the oil in a skillet over medium heat. Add the onion and saute until starting to soften, 2-3 minutes. Stir in the garlic. Add the mushrooms and zucchini and saute until softened, another 5-6 minutes. Season the mixture to taste with salt and pepper.

Step 2

Stir in the Italian sausage and cook until browned, stirring often. Stir in the tomatoes, chicken broth, and marinara sauce and bring to a boil. Gently stir in the tortellini, nestling into the liquid. Season with oregano. Cover and cook for 7-10 minutes, stirring every few minutes, until tortellini is tender and cooked through. Remove the mixture from heat and stir in spinach until wilted.

Step 3

Preheat the broiler. Sprinkle the skillet with cheese then place under the broiler for 5 minutes or until cheese is melted and starting to brown. Sprinkle with basil and serve immediately.