Preheat Your Oven'S Broiler. Place 6 Slices Of Bread Onto A Baking Sheet. Spread A Small Handful Of The Mozzarella Cheese Over Each Slice. Top With The Remaining 6 Slices Of Bread. Mix Together The Butter And Garlic Powder, Brush Some Over The Tops Of The Sandwiches, Or Spread With The Back Of A Tablespoon. Sprinkle With Dried Oregano. Place Baking Sheet Under The Broiler For 2 To 3 Minutes, Until Golden Brown. Remove Pan From Oven, Flip Sandwiches, And Brush The Other Sides With Butter, And Sprinkle With Oregano. Return To The Broiler, And Cook Until Golden, About 2 Minutes. Cut Sandwiches In Half Diagonally, And Serve Immediately With Vodka Sauce On The Side For Dipping.