In a large pot or Dutch oven, cook the ground beef or ground turkey over medium heat until browned.
Add the diced onion, minced garlic, jalapeño and diced bell pepper to the pot. Sauté for about 5 minutes, or until the vegetables have softened.
Add the diced tomatoes, kidney beans, black beans, and tomato sauce to the pot. Stir to combine.
Sprinkle the taco seasoning, chili powder, cumin, salt, and pepper over the mixture. Stir well to evenly distribute the spices.
Bring the chili to a simmer and let it cook for about 20-30 minutes, stirring occasionally.
Taste and adjust the seasonings if needed. Add more chili powder or spices according to your preference.
Serve the taco chili hot in bowls, and garnish with your favorite toppings such as shredded cheese, sour cream, sliced jalapeños, chopped cilantro, diced avocado, or tortilla chips.