Start by prepping all of the veggies. Cut the red onion, bell peppers, and the poblano pepper.
If using the serrano pepper, de-seed and add the seeds to the tequila. Let the seeds soak in the Tequila until you are ready to add it. (This adds flavor and a bit of spiciness, but not to the level where it is over-powering).
Heat your soup pot on medium and add your oil or butter.
Add the red onion, bell peppers, and poblano/serrano peppers. Cook until the red onion is fairly translucent and the peppers are soft. About 10-15 minutes.
Add your garlic and gently cook until fragrant; about 2-3 minutes.
Strain the seeds from the tequila and then add the tequila to the pot. Increase the heat slightly to cook off the alcohol; I also smell for the sharpness of the alcohol to reduce. This can take about 3-4 minutes.
Add the chicken stock and then bring to a boil. Reduce the heat to a simmer and cook for about 20 minutes.
While the soup is cooking, drain and rinse the black beans and shred your chicken. Then add to the soup.
Serve with a dollop of sour cream, bit of salsa, cheese, and crushed tortilla chips! Enjoy!