In a large pot over medium heat, heat the olive oil. Add the onion and garlic and cook until the onion is softened, about 5 minutes.
Add the vegetable broth, lentils, mushrooms, thyme, and salt and pepper. Bring to a boil, then reduce the heat to low and simmer for 30 minutes, stirring occasionally.
Taste and adjust the seasoning if necessary. Serve hot.
Interesting Facts
Portobello mushrooms are high in protein and low in calories.
Lentils are a great source of fiber, protein and minerals.