Heat olive oil in a large skillet over medium heat and add the ground turkey. Cook for about 6 to 8 minutes, breaking it apart with a spoon until no pink remains. This step isn't mandatory, but it adds a richer, roasted flavor to the final chili. If you're using leftover cooked turkey, skip straight to the next step and add it in chopped or shredded.
In the same skillet, toss in the diced onion, bell pepper, and garlic. Cook for 3 to 4 minutes until the onion turns soft and translucent. This little extra effort wakes up the flavors before everything goes into the slow cooker to simmer for hours.
Move the turkey and sautéed vegetables into your slow cooker. Add the diced tomatoes, tomato sauce, both cans of beans, corn, and broth. Give it all a good stir so the spices distribute evenly through the mixture.
Sprinkle in the chili powder, cumin, smoked paprika, salt, and pepper. If you're using the chipotle pepper for heat, stir it in now. Mix everything thoroughly so no dry spice pockets are left sitting at the bottom.
Cover and cook on low for 6 hours or on high for 4 hours. The longer, low setting gives the flavors more time to meld, which I personally prefer for a richer tasting chili.
About 30 minutes before serving, give the chili a taste. Add more salt, pepper, or chili powder depending on how bold you like it. This is also when I decide if it needs a splash more broth to loosen the consistency.
Ladle the chili into bowls and top with your favorite garnishes. It's ready to eat straight from the slow cooker, and it only gets better as leftovers.