Ingredients:
- 1 large egg
- 1 15- to 16-ounce container part-skim ricotta
- 1 5-ounce package baby spinach, coarsely chopped
- 3 large or 4 small portobello mushroom caps, gills removed (see tip), halved and thinly sliced
- 1 small zucchini, quartered lengthwise and thinly sliced
- 1 28-ounce can crushed tomatoes
- 1 28-ounce can diced tomatoes
- 3 cloves garlic, minced
- Pinch of crushed red pepper (optional)
- 15 whole-wheat lasagna noodles (about 12 ounces), uncooked
- 3 cups shredded part-skim mozzarella, divided
