Slow-Cooker Vegetarian Black Bean Chili

Ingredients

• 2 tablespoons vegetable oil
• 2 onions, chopped fine
• 2 red bell peppers, stemmed, seeded, and chopped fine
• 2 jalapeño chiles, stemmed, seeded, and minced
• 9 garlic cloves, minced
• 3 tablespoons chili powder
• 4 teaspoons mustard seeds
• 1 tablespoon minced canned chipotle chile in adobo sauce
• 1 tablespoon ground cumin
• 1 tablespoon dried oregano
• 2½ cups vegetable or chicken broth, plus extra as needed
• 2½ cups water
• 1 pound (2½ cups) dried black beans, picked over and rinsed
• 10 ounces white mushrooms, trimmed and halved if small or quartered if large
• 2 bay leaves
• 1 (28-ounce) can whole peeled tomatoes, drained and cut into 1/2-inch pieces
• 2 tablespoons minced fresh cilantro
• Salt
• pepper
• Lime wedge