Heat olive oil in a large pot over medium heat.
Add chopped onions and bell peppers, and sauté for about 5 minutes.
Stir in minced garlic and cook for 1-2 minutes until fragrant.
Add the ground meat, breaking it apart as it cooks.
Stir in chili powder and cumin, cooking for an additional minute.
Add diced tomatoes, black beans, quinoa, and vegetable broth.
Bring the mixture to a boil, then reduce heat to low and cover the pot.
Simmer for about 20 minutes, checking occasionally.
Taste and adjust seasoning with salt and pepper if needed.
Serve hot, garnishing with your favorite toppings if desired.