Heat the olive oil in a large pot over medium heat.
Once hot, add the diced onion, chopped bell pepper, and minced garlic.
Cook until the vegetables are soft, about 5 minutes.
Add the lean ground turkey to the pot, breaking it apart with a spoon while it cooks.
Brown the turkey thoroughly until it loses its pink color.
Pour the canned tomatoes along with their juices into the pot.
Stir in the chili powder, cumin, salt, and black pepper.
Combine all the ingredients well.
Add the drained black beans and kidney beans to the turkey mixture.
Stir everything and let it simmer over low heat.
Cook uncovered for around 30 minutes, stirring occasionally.
Taste the chili and adjust seasonings if needed.
Serve warm with your favorite toppings like cheese or sour cream.