In a large bowl, combine the all-purpose flour, whole wheat flour, baking powder, and salt. Add the olive oil and warm water, and mix until a soft dough forms.
On a lightly floured surface, roll out the dough into a large circle.
Using a heart-shaped cookie cutter, cut out 12 hearts from the dough.
In a small bowl, mix together the pizza sauce, mozzarella cheese, and pepperoni.
Place 1 teaspoon of the pizza mixture in the center of each heart.
Fold the dough in half and pinch the edges together to seal.
Place the calzones on a baking sheet lined with parchment paper.
Brush the calzones with the beaten egg.
Bake in a preheated oven at 350°F (175°C) for 20-25 minutes, or until golden brown.
Remove from the oven and let cool before serving.
Interesting Facts
Calzones originated in Naples, Italy and were traditionally filled with ricotta cheese and ham.
Whole wheat flour is a source of fiber, vitamins, and minerals.
The heart-shaped calzones are the perfect treat for Valentine's Day.