Coat the bottom of a large pot with oil and place it over medium heat. When the oil is hot, add the onion and bell pepper. Sweat the vegetables while stirring occasionally until the pepper is softened and the onion translucent, about 5 minutes.
Add the garlic, chili powder, cumin, ancho chile powder, and paprika. Stir to coat the onions and peppers with the spices, then sauté the mixture for about a minute, until it becomes very fragrant.
Stir in the broth, diced tomatoes, crushed tomatoes, black beans, pinto beans, and quinoa. Raise the heat and bring the liquid to a boil.
Lower the heat and let the chili simmer for about 30 minutes, stirring occasionally, until it has thickened and the quinoa is tender (Note 1). You can add a bit of water if the chili gets too thick while cooking.
Stir in the corn, then remove the pot from heat.
Season the chili with salt and pepper to taste.
Ladle into bowls and serve.