Heat a large pot over medium heat. Add the andouille sausage and cook, stirring occasionally, until it begins to brown.
Add the onion, garlic, and mushrooms and cook, stirring occasionally, until the vegetables are softened, about 5 minutes.
Add the chicken broth, lentils, oregano, thyme, red pepper flakes, salt, and pepper. Bring to a boil, then reduce the heat and simmer for 30 minutes, until the lentils are tender.
Serve hot.
Interesting Facts
Andouille sausage is a Cajun specialty made with pork, garlic, and herbs.
Lentils are a great source of plant-based protein and fiber.
This soup is vegan and can be made gluten-free by using a gluten-free broth.