Heat the olive oil in a medium pot over medium heat.
Add the diced onion and bell pepper to the pot and sauté for 4-5 minutes until the vegetables are softened and fragrant.
Add the diced chicken breast and minced garlic, cooking until the chicken is browned on all sides.
Stir in the chili powder, cumin, sea salt, and black pepper, ensuring the chicken and vegetables are evenly coated in the spices.
Pour in the tomato puree, rinsed black beans, and water, stirring well to combine.
Bring the mixture to a gentle boil, then reduce the heat to low and cover.
Simmer for 15-20 minutes, stirring occasionally, until the chicken is cooked through and the chili has thickened slightly.