In a large skillet, heat the olive oil over medium heat. Add the diced bell peppers and sauté for about 5 minutes, or until they begin to soften.
Stir in the quinoa, black beans, corn, and diced tomatoes into the skillet.
Add the cumin, paprika, garlic powder, salt, and pepper to the mixture. Pour in 2 cups of water or vegetable broth. Stir everything together.
Bring the mixture to a boil, then reduce the heat to low, cover, and let it simmer for about 15-20 minutes, or until the quinoa is cooked and has absorbed the liquid.
Remove the skillet from heat and let sit covered for an additional 5 minutes. Fluff the quinoa with a fork.
Taste and adjust seasonings as needed.
Serve hot, garnished with fresh cilantro and slices of avocado on the side.
Notes
Feel free to customize with your favorite vegetables.