Gluten Free &amp; Low Carb Zucchini Lasagna  Ingredients:    1 lb 93% lean beef  3 cloves garlic  1/2 onion  1 tsp olive oil  salt and pepper  28 oz can crushed tomatoes  2 tbsp chopped fresh basil  3 medium zucchini, sliced 1/8&quot; thick  15 oz part-skim ricotta  16 oz part-skin mozzarella cheese, shredded (Sargento)  1/4 cup Parmigiano Reggiano  1 large egg