Preheat the oven to 400°F.
Line a rimmed baking sheet with parchment paper.
Use a 4-inch heart-shaped cookie cutter to cut each tortilla into a heart shape.
Place the tortilla hearts evenly spaced on the prepared baking sheet.
Use the same heart-shaped cookie cutter to cut the mozzarella slices into hearts.
Place one mozzarella heart on top of each tortilla heart.
Use a small 1-inch heart-shaped cookie cutter to cut the pepperoni slices into heart shapes.
Place three small pepperoni hearts on top of each mozzarella slice.
Bake the tortilla pizzas for 6 to 8 minutes, until the cheese is melted and the edges are lightly crisp.
Remove from the oven and let rest briefly before serving.