1. Heat 1 teaspoon vegetable oil in a large, deep skillet over medium-high heat. Add chicken breasts and cook until browned, about 4 minutes. Reduce heat to medium, flip breasts, cover the pan, and cook until browned on the other side, about 5 minutes. Remove to a plate and allow to cool before chopping into cubes.

2. Return skillet to medium heat, add 1 teaspoon vegetable oil, onion, salt, and black pepper. Cook and stir until onion turns translucent, 4 to 5 minutes. Stir in garlic and cook until fragrant, about 1 minute.

3. Stir ancho chili powder, cumin, flour, chipotle pepper powder, and oregano into onion mixture; cook and stir for 2 to 3 minutes. Add 1 cup of chicken broth and stir, scraping up any brown bits off the bottom of the pan.

4. Stir in beans and 1 more cup of chicken broth. Cut cooled chicken breasts into cubes, add to chili and bring to a simmer. Add remaining cup of chicken broth, season with salt, black pepper, sugar, and cayenne pepper to taste.

5. Cook until heated through. Serve garnished with green onions, sour cream, and cilantro.