This Slow-Cooker Vegetarian Tex-Mex Casserole is a hearty and flavorful dish that is perfect for a crowd. Packed with black beans, corn, bell peppers, and spices, it's a satisfying and nutritious meal. Simply layer the ingredients in the slow cooker and let it cook on low for a few hours. Serve it with your favorite toppings like avocado, sour cream, and cilantro for a complete Tex-Mex experience.