Sauté the Sausage & Onion
Heat a Dutch oven or heavy-bottomed pot over medium-high heat. Once hot, lightly spray with oil and add the sausage. Let the fat render naturally while breaking it apart with a spatula. Add the diced onions and cook until they become soft and slightly browned at the edges.
Brown the Ground Turkey
Add the ground turkey to the pot and cook until nearly done, breaking it into crumbles as it browns. Just before the turkey is fully cooked, add the garlic and herb blend, sage, and fennel. Stir well to coat the meat and cook for another 2 minutes.
Simmer the Soup
Pour in the crushed tomatoes and chicken broth, then bring the mixture to a gentle simmer. Break the lasagna sheets into smaller pieces and add them along with the bay leaves. Reduce the heat to low-medium, cover, and let it simmer for at least 20 minutes.
Add the Zucchini
Stir in the sliced zucchini and cook for 10-15 minutes if serving immediately. If making for meal prep, add the zucchini and remove the soup from heat to prevent overcooking.
Top with Cheese & Serve
Divide the soup into bowls or meal prep containers. Sprinkle each serving with about three tablespoons of mozzarella. Melt the cheese using a microwave or place the bowls in the oven under the broiler until bubbly. Garnish with fresh parsley and enjoy!