1cupprovolone cheesewe used thinly sliced provolone and just allowed it to melt into the sauce
In a skillet, over medium heat, brown your ground beef with a little bit of olive oil and your minced garlic. Break the beef up into smaller chunks.
Once the meat is browned, toss in the green bell pepper and the onion. Cook for 4 minutes or until onions become tender. Drain all the liquid out.
Season the meat with a little salt and/or pepper.
In a saucepan over medium-high heat, melt the butter. Stir in the flour and cook for one minute, stirring continuously. Using a fork, whisk in the milk and cook for about 2-3 more minutes or until the flour/milk mixture is thickened and bubbling.
Reduce heat to low, and stir in the cheese until it is completely melted into the sauce.
I usually add a sprinkle or two of garlic salt to give it a little more flavor, but this is completely optional.
Scoop the meat onto each bun and then ladle on the cheese sauce. Add some sauteed mushrooms is you desire (I desired) and pop the top of the bun on and eat! Enjoy!