Remove the browned ground beef from the skillet, leaving any fat behind in the pan. Add the butter to the skillet. Once melted, add the diced onion, green bell pepper, and minced mushrooms. Let them brown for 1-2 minutes without stirring to allow them to develop a slight caramelization. Stir and let brown for another 1-2 minutes.
Step 4: Combine Ingredients
Return the browned ground beef to the skillet with the sautéed vegetables. Stir to combine. In a small cup, mix the beef broth and cornstarch until smooth. Add this mixture to the skillet along with the ketchup, Worcestershire sauce, Kosher salt, and black pepper. Stir everything together until well combined.
Step 5: Thicken the Mixture
Cook the mixture over medium heat, allowing it to simmer until it thickens. You want about 75% of the mixture to be above the liquid. This should take approximately 3-5 minutes. The cornstarch will help thicken the sauce, making it the perfect consistency for a sloppy joe filling.
Step 6: Add the Cheese
Once the mixture has thickened, turn off the heat and add the chopped provolone cheese. Stir until the cheese is fully melted and incorporated into the beef mixture. The cheese will give the filling a creamy, gooey texture that’s absolutely delicious.
Step 7: Toast the Buns
While the cheese is melting, you can toast your brioche hamburger buns. This step is optional but highly recommended as it adds a lovely crunch and prevents the buns from becoming too soggy. Simply place them under a broiler for a minute or two, or toast them in a separate skillet until they are golden brown.
Step 8: Assemble and Serve
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