1.Preheat Oven To 400 Degrees F (200 Degrees C). Line A Baking Sheet With Parchment Paper. Lay The 4 Slices Of Italian Bread Out On The Prepared Baking Sheet; Top Each Piece Of Bread With A Tomato Slice, A Basil Leaf, And A Slice Of Mozzarella Cheese. 2.Bake In The Preheated Oven Until The Cheese Has Melted, About 7 Minutes. Drizzle Each Sandwich With 1/2 Tablespoon Of Olive Oil And Balsamic Vinegar.