Instructions

1. Place the onion, bell pepper, and celery in a large saucepan over medium-high heat. Cook, stirring occasionally and adding water 1 to 2 tablespoons at a time as needed to keep the vegetables from sticking, until the onions start to turn translucent, about 5 minutes.
2. Add the garlic and thyme and cook until the garlic is softened and fragrant, about 1 minute. Add the kidney beans and vegetable broth. Bring to a boil over medium-high heat. Reduce the heat to medium-low and cook, covered, to allow the flavors to come together, about 10 minutes.
3. Stir in the quinoa. Season with salt, black pepper, and red pepper flakes (if using), and simmer, covered, until the quinoa is cooked and the flavors are well blended, 12 to 15 minutes. Taste and adjust the seasoning. Serve hot.