Add 1 cup of chicken stock and 1 1/2 cans of drained beans to a tall jar. Use an immersion blender to blend until smooth. Set aside.
Heat olive oil in a medium to large pot over medium-high heat. Add onions and garlic and sauté until fragrant. Add cumin, oregano, red pepper flakes, and pepper. Stir to combine.
Add bean and chicken stock mixture and all remaining ingredients. Stir to combine, then lower heat to a simmer for 15-20 minutes.
Serve with shredded cheese, sour cream, chopped avocado, and tortilla chips if desired.
Notes
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