The trick to making a delicious low carb lasagna is to substitute sliced zucchini for pasta noodles and then cover them in a hearty tomato sauce. While this vegetarian, gluten-free recipe suggests adding spinach in the sauce, feel free to use your favorite ingredients in the sauce. Topping the layers of zucchini noodles with skim ricotta cheese and skim mozzarella cheese makes this the perfect skinny lasagna recipe. One cup of chopped zucchini contains only 21 calories and 22 mg of Vitamin C! A quick and easy dinner that the whole family will enjoy!