Steps
1. Heat the olive oil in a large pot over medium heat.
2. Add the onions, carrots, celery, zucchini, yellow squash, and mushrooms. Cook for 5 minutes, stirring frequently.
3. Add the vegetable broth, lentils, garlic, cumin, oregano, salt, and pepper.
4. Bring the mixture to a boil, then reduce the heat to low.
5. Cover the pot and simmer for 15-20 minutes, or until the lentils are tender.
6. Serve hot and enjoy!