Heat a large skillet over medium high heat.

Add the ground beef and brown until a deep brown crust appears before breaking the beef apart.

Remove the beef (you can leave the fat) and add the butter and the onions and bell peppers. Let brown for 1-2 minutes before stirring, then let brown for another 1-2 minutes before stirring again.

Remove any excess grease. Add the beef back into the pan.

In a small measuring cup mix the beef broth and cornstarch together.

Add the ketchup, Worcestershire sauce, salt, black pepper, and whisk then pour the beef broth/cornstarch mixture into the pan.

Cook until the mixture is mostly soaked up so it’s not as watery, about 3-5 minutes.

Turn off the heat, add in the cheese.

In a pan, heat a little more butter over medium high heat and toast the buns then remove to a plate. Serve meat on toasted brioche buns.