Put the chicken in the slow cooker. Add 3 tablespoons of the chili powder and all the rest of the ingredients, except the beer. Stir everything together, cover, and cook on LOW for 6 to 8 hours.
Just before serving, stir in the remaining 2 teaspoons of chili powder, the beer, if using, and season with more salt and pepper, to taste, if desired. Divide the chili among warm bowls. Serve with the topping of your choice.
Know-How: Stirring in chili powder right before serving brightens the flavor of the chili.
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