Place 1 cup stock, soup mix, corn, chipotle peppers and liquid, cumin and chili powder in slow cooker, turn on high.
Heat 2 tablespoons oil in a large skillet over medium-high. lightly flower meat. Cover bottom of pan with 1 layer of meat and brown until dark, it may take 2 or 3 batches depending on pan sizes. Add meat to cooker as it becomes browned. When last of meat is brown, place remaining beef stock to skillet, warm and scrape all contents of skillet to cooker. Reduce heat to low and cook for at least 6 hours. Salt and pepper to taste.

I like to serve buffet style with cups of cheese, sour cream, lettuce, tomato's. Add 3-4 tablespoons of meat mixture and add cheese, lettuce, etc. as desired.