easy mexican chicken chili

Ingredients

• 2 tablespoons butter
• 1/4 cup chopped onion
• 1 tablespoon flour
• 1/2 teaspoon salt and pepper
• 1 cup chicken broth (sometimes i add more at the end to make it soupier)
• 1 - rotisserie chicken, precooked, deboned
• 1/2-1 tablespoon southwest seasoning mix (amount depends on how much heat you want))
• 1 can black beans, drained and rinsed (15 oz)
• 3 tablespoons canned chopped green chilies
• 1 cup frozen corn
• OPTIONAL
• - (topping) shredded cheese, like pepper jack cheese
• - (topping) thick and chunky salsa
• - (topping) sour cream
• - (topping) chopped avocado