Start by dicing the onion, mincing the garlic, and chopping the bell pepper into bite-sized pieces. Drain and rinse the kidney and black beans thoroughly to remove excess sodium and any canned flavor. Open the diced tomato can and set aside.
Heat the olive oil in a large skillet over medium-high heat. Add the ground turkey, breaking it apart with a wooden spoon. Cook until browned and no longer pink, about 5-7 minutes.
Add the diced onion, bell pepper, and minced garlic to the skillet with the turkey. Cook for another 3-4 minutes, stirring occasionally, until the vegetables soften and the onions become translucent.
Transfer the cooked turkey and vegetables into your slow cooker. Add the drained kidney beans, black beans, diced tomatoes (with their juices), chili powder, cumin, paprika, salt, and pepper. Pour in the chicken broth.
Cover the slow cooker and cook on low for 6-8 hours or on high for 3-4 hours.
Before serving, taste the chili and adjust the seasoning with more salt, pepper, or chili powder if desired. Serve hot with optional toppings like shredded cheese, diced avocado, or fresh cilantro.