Mix carrots, oregano, and spaghetti sauce together.
Mix ricotta, spinach, and eggs together in separate bowl.
Spread ½ cup spaghetti sauce in bottom of 9 x 13 inch baking dish.
Layer 3 lasagna noodles, ½ remaining sauce, ½ Ricotta mixture, ½ sliced zucchini, ½ sliced mushrooms, ½ Mozzarella, and ½ Parmesan.
Repeat layers with remaining ingredients.
Bake in 350 degrees oven for about 45 minutes to one hour. Let sit for 10 or 15 minutes after baking.