Heat olive oil in a large pot over medium heat. Add onion and garlic and cook until softened, about 5 minutes.
Add mushrooms and cook until softened, about 5 minutes. Add lentils, potatoes, broth, and thyme. Bring to a boil, reduce heat, and simmer for 30 minutes.
Season with salt and pepper to taste. Serve warm.
Interesting Facts
Mushrooms are a great source of protein, vitamins, and minerals.
Lentils are high in fiber and a good source of iron.