Heat oven to 425 degrees F. Line a baking sheet with tin foil.
Place the flatbread on a cutting board and cut into a heart shape using a knife or a heart cookie cutter.
Place pepperoni on the cutting board and cut into a heart shapes using a knife or small heart cookie cutter.
Place the heart shaped cookie cutter on the baking sheet, spread with tomato sauce and sprinkle with cheese. Add on the heart pepperoni.
Bake for 8-10 minutes or until cheese is melted. Transfer pizza to cutting board and let cool competely before packing in a lunch box.