Whisk Eggs, Milk, Garlic Powder, Italian Seasoning, And Parmesan Cheese Together In A Bowl. Place Each American Cheese Slice Between Two Pieces Of Bread To Assemble 6 Sandwiches. Dip Both Sides Of Each Sandwich In Egg Mixture. Heat A Non-Stick Frying Pan Over Medium Heat. Place Dipped Sandwiches In The Hot Frying Pan; Cook Until Golden Brown And Cheese Is Melted, About 3 Minutes Per Side.