Mushroom Cheesesteak Sandwiches

Name: Mushroom Cheesesteak Sandwiches
Ingredients: 8 tablespoons (1 stick) salted butter; 1 pound white mushrooms, sliced; 1 pound portobello mushrooms, sliced; 8 ounces cremini mushrooms, sliced; 8 ounces oyster, shiitake or other wild mushrooms, roughly chopped; Kosher salt; 1 teaspoon Montreal steak seasoning; Few dashes Worcestershire sauce; 2 sprigs fresh thyme; 1 yellow onion, sliced; 1 green bell pepper, sliced; 1 red bell pepper, sliced; 1/2 teaspoon black pepper; 1/4 teaspoon cayenne pepper; One 15-ounce jar processed cheese sauce or spread, such as Cheez Whiz; 4 deli rolls, halved; 4 tablespoons spicy mustard; 4 tablespoons mayonnaise