Brown the ground beef over medium heat, crumbling the meat as it cooks. Drain grease.
Add the ground beef, onion, and pepper to a 6 quart slow cooker.
Add the beans, reserving the seasoning packet for later, and the beef broth to the crock pot. Cover and cook on high for 5-6 hours or until beans are tender.
Once beans are tender, use a soup ladle to remove around 1-2 cups excess liquid from the slow cooker. Discard liquid.
Add the remaining ingredients to the slow cooker along with the flavor packet and stir well to combine. Taste and adjust seasoning as needed.
Continue cooking for 30 minutes with the lid off of the slow cooker to allow the mixture to thicken slightly.
Serve on buns and enjoy!
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Notes
You may use any flavor of 15 Bean Soup that you prefer. Alternately, reserve the seasoning packet for another use and leave it out of this recipe entirely.