Cook until the meat is no longer pink, stirring frequently and breaking into smaller pieces as you go. Then, transfer the cooked beef to a large mixing bowl.
Spray the same skillet with cooking spray. Add the diced pepper, onion, and mushrooms and cook on medium heat until veggies are tender, about 6-7 minutes.
Then, in a separate mixing bowl, add all the sloppy joe sauce ingredients. Whisk to combine. Pour sauce into the bowl with the beef and veggies and stir.