If you have time, heat the olive oil in a skillet over medium heat. Add the onion, carrots, and celery and cook for 3–4 minutes, until they start to soften. Stir in the garlic and cook for 30 seconds more. Transfer to the slow cooker.
1 tablespoon olive oil, 1 medium yellow onion, 3 cloves garlic, 2 medium carrots, 2 ribs celery
To a 5–6 quart slow cooker, add the sautéed vegetables (or onion, carrots, celery, and garlic raw if you skipped sautéing), bell pepper, zucchini, butternut squash, rinsed brown rice, black beans, kidney beans, chickpeas, diced tomatoes with juices, tomato paste, cumin, smoked paprika, oregano, chili powder, salt, pepper, and bay leaf.
1 medium yellow onion, 3 cloves garlic, 2 medium carrots, 2 ribs celery, 1 red bell pepper, 1 medium zucchini, 1 cup butternut squash, 1 cup brown rice, 1 can (15 oz) black beans, 1 can (15 oz) kidney beans, 1 can (15 oz) chickpeas, 1 can (14.5 oz) diced tomatoes, 2 tablespoons tomato paste, 1 1/2 teaspoons ground cumin, 1 teaspoon smoked paprika, 1 teaspoon dried oregano, 1/2 teaspoon chili powder, 1 1/4 teaspoons fine sea salt, 1/2 teaspoon black pepper, 1 bay leaf
Pour the vegetable broth over the ingredients in the slow cooker. Stir well so the tomato paste dissolves and the rice and beans are evenly distributed. Make sure the rice is fully submerged in liquid.
4 cups vegetable broth, 2 tablespoons tomato paste, 1 cup brown rice, 1 can (15 oz) black beans, 1 can (15 oz) kidney beans, 1 can (15 oz) chickpeas
Cover and cook on LOW for 6–7 hours or on HIGH for 3–4 hours, until the rice is tender and the vegetables are soft but not mushy. Slow cookers vary, so begin checking toward the earlier end of the time range.
Remove the bay leaf. Taste the stew and adjust seasoning with additional salt, pepper, or chili powder if desired. If the stew is thicker than you like, stir in a splash of hot vegetable broth or water until it reaches your preferred consistency.
1 1/4 teaspoons fine sea salt, 1/2 teaspoon black pepper, 1/2 teaspoon chili powder
Ladle the stew into bowls. Top with shredded cheese, a spoonful of Greek yogurt or sour cream, fresh cilantro or parsley, and a squeeze of lime. Serve with crushed tortilla chips on top or crusty bread on the side, if desired.
fresh cilantro or parsley, shredded cheddar or Monterey Jack cheese, plain Greek yogurt or sour cream, lime wedges, crushed tortilla chips or crusty bread
For deeper flavor, let the stew sit in the slow cooker on the KEEP WARM setting for 20–30 minutes before serving to allow the flavors to meld.