Superbowl Update: Sunday Cheesesteak Sandwiches

Name: Superbowl Update: Sunday Cheesesteak Sandwiches
Ingredients: 6 Tablespoon of Cat Cora’s Kitchen by Gaea’s Kalamata D.O.P. Greek Extra Virgin Olive Oil; 1 Green Bell Pepper (Thinly Sliced); 1 Red Bell Pepper (Thinly Sliced); 1 Cup Mushrooms (Thinly sliced); 1 Large Onion (Sliced Paper-thin); 2 Tablespoon Fresh Oregano (Chopped); ½ Teaspoon Kosher Salt; 1½ Pound Rib-eye Steak, 1 inch thick; 4 Crusty Hoagie Rolls (Sliced); 1 Tablespoon Unsalted Butter; ½ Pound Provolone Cheese (Diced Small); 2 Large Egg Yolks (Beaten); 1 Tablespoon All-Purpose Flour; 1½ Cup Whole Milk