Low-Calorie & High-Protein Zucchini Lasagna

Ingredients

• 1 tbsp olive oil
• 1 onion, diced
• 4 garlic cloves, minced
• 1 lb (450 g) ground beef, extra lean
• 1 cup crushed tomatoes
• 2 bay leaves
• 1 tsp dried oregano
• sea salt and freshly ground black pepper, to taste
• 3 zucchini
• 2 cups mozzarella cheese, shredded
• 2 cups mushrooms, sliced
• 1 cup ricotta cheese
• 2 tbsp Parmesan cheese, freshly grated
• 1 tbsp fresh parsley, minced