Cheesy Zucchini Casserole is the perfect five ingredient meal! This easy keto casserole is loaded with fresh zucchini, meat, marinara and cheese for about 2 net carbs per serving!
Thinly slice the zucchini using a mandoline slicer (tips in post)). Preheat a grill or grill pan to medium heat and lightly spray the cooking surface with oil and grill the zucchini 1-2 minutes on each side until they have begun to brown and there is very little steam coming off the zucchini.
Preheat the oven to 400 degrees F.
Place the grilled zucchini in a greased 11x7 baking dish. Top the zucchini with cooked Italian sausage, marinara and sliced fresh mozzarella.
Bake for 20-25 minutes or until the cheese is bubbly. Top the casserole with parmesan, 1 teaspoon Italian seasoning, salt and pepper to taste.
Allow the casserole to sit 10 minutes before slicing to allow it to reabsorb some of the liquid.