Chop the onion, carrots, celery, bell pepper, and zucchini into bite-sized pieces. Mince the garlic if using fresh.
1 medium yellow onion, 3 cloves garlic, 2 medium carrots, 2 stalks celery, 1 medium red bell pepper, 1 medium zucchini
To a 5–6 quart slow cooker, add the onion, carrots, celery, bell pepper, zucchini, lentils, black beans, kidney or pinto beans, diced tomatoes with their juices, tomato sauce, and corn.
1 medium yellow onion, 2 medium carrots, 2 stalks celery, 1 medium red bell pepper, 1 medium zucchini, 1 cup dried brown or green lentils, 1 can (15 oz) black beans, 1 can (15 oz) kidney beans or pinto beans, 1 can (14.5 oz) diced tomatoes, 1 can (8 oz) tomato sauce, 1/2 cup corn kernels
Sprinkle in the chili powder, cumin, smoked paprika, oregano, salt, pepper, and bay leaf. Drizzle the olive oil over the top.
1 tablespoon olive oil, 2 teaspoons chili powder, 1 teaspoon ground cumin, 1 teaspoon smoked paprika, 3/4 teaspoon kosher salt, 1/2 teaspoon black pepper, 1 teaspoon dried oregano, 1 whole bay leaf
Pour in the vegetable broth and stir well, making sure the lentils are submerged. The vegetables will release additional liquid as they cook.
4 cups vegetable broth, 1 cup dried brown or green lentils
Cover and cook on LOW for 7–8 hours or on HIGH for 3 1/2–4 hours, until the lentils are tender and the vegetables are soft but not mushy. Check earlier if your slow cooker runs hot.
Remove the bay leaf. Stir in the lemon or lime juice, then taste and adjust salt and pepper as needed.
1 whole bay leaf, 1/2 whole lemon, 3/4 teaspoon kosher salt, 1/2 teaspoon black pepper
Ladle the stew into bowls. Top with shredded cheese, green onions or cilantro, and a dollop of sour cream or Greek yogurt. Serve with crushed tortilla chips, warm bread, or cooked brown rice if desired.
shredded cheddar or pepper jack cheese, sliced green onions or fresh cilantro, sour cream or plain Greek yogurt, crushed tortilla chips, warm crusty bread, or cooked brown rice