Add the rinsed quinoa, black beans, kidney beans, diced tomatoes, tomato sauce, and vegetable broth to your slow cooker.
Stir in the diced bell pepper, onion, and minced garlic.
Add the chili powder, cumin, smoked paprika, salt, and pepper. Mix everything thoroughly.
Cover and cook on low for 4 hours or on high for 2 hours, until the quinoa is tender and has absorbed most of the liquid.
Stir in the frozen corn during the last 30 minutes of cooking.
Taste and adjust seasonings as needed. Serve hot with your favorite toppings like diced avocado, fresh cilantro, a squeeze of lime, and crunchy tortilla chips.