1-First, preheat the oven to 400°F (200°C) and coat a large rectangular baking dish with cooking spray. Cut the zucchini in half lengthwise, trim off the stem ends, and scoop out the flesh to make hollow shells. Sprinkle the zucchini shells with Italian seasoning, salt, and pepper, then arrange them in the baking dish for even cooking.

2-Next, heat olive oil in a large pan over medium-high heat and cook the sausage for 4-5 minutes, breaking it up as it browns. Add the onion and cook for 4 minutes until softened, then stir in the garlic and cook for 30 seconds to release its aroma. Season the mixture with salt and pepper, pour in the marinara sauce, and let it simmer for 5 minutes to blend the flavors.

3-Once the filling is ready, spoon it evenly into the zucchini shells and top with shredded mozzarella cheese. Bake for 25 minutes until the zucchini is tender and the cheese melts into a golden layer. Finish by sprinkling chopped parsley over the top before serving warm, creating a dish that’s full of savoriness and color.