Preheat oven to 350°F.
Mix carrots, oregano, and spaghetti sauce together in a bowl.
In a separate bowl, mix ricotta cheese, spinach, and eggs together until well combined.
Spread 1/2 cup of the spaghetti sauce mixture in the bottom of a 9 x 13 inch baking dish.
Layer 3 lasagna noodles over the sauce.
Add half of the remaining sauce, half of the ricotta mixture, half of the sliced zucchini, half of the sliced mushrooms, half of the mozzarella, and half of the parmesan cheese.
Repeat layers with remaining ingredients.
Bake for about 45 minutes until bubbly and golden on top.
Let rest for 10 minutes before serving.