Fill a medium saucepan with water and bring the pot to a boil.
Adjust the heat to low and add quinoa to the pan. Cook the quinoa for 12 minutes.
When the quinoa is done, drain it from the hot water using a metal strainer. Then, let cold water run over the quinoa for a few seconds. After that, let the quinoa sit in the strainer over a bowl for a few minutes to drain completely.
Heat the oil in a large pot over medium heat.
Add the onion and garlic and saute until tender.
Add the cayenne pepper and cumin powder and chopped green and red bell peppers. Continue to cook for two minutes.
Pour the diced peeled tomato, tomato purée, vegetable broth, and lemon juice in the pot. Stir and bring the mixture to a boil. Boil the chili for about five minutes.
Then, add the beans, corn, olives, cilantro and cooked quinoa. Stir to combine all the ingredients, and cook for another five minutes until heated through.
Garnish with fresh cilantro leaves, lime wedges and sliced green olives if desired.
Serve and enjoy!