Make the Dough:

1. Activate the Yeast: In a small bowl, combine the warm water, sugar, and yeast. Let it sit for 5-10 minutes until frothy.
2. Mix the Dough: In a large bowl, combine the flour and salt. Add the yeast mixture and olive oil. Mix until the dough comes together.
3. Knead the Dough: Knead the dough for 5 minutes until smooth and elastic.
4. Let the Dough Rise: Place the dough in a lightly oiled bowl, cover it, and let it rise for 1 hour, or until doubled in size.

Prepare the Filling:

1. Make the Filling: In a medium bowl, mix the ricotta, mozzarella, Parmesan, diced pepperoni, garlic powder, Italian seasoning, salt, and pepper. Set aside.

Shape the Calzones:

1. Preheat the Oven: Preheat the oven to 425°F (220°C) and line a baking sheet with parchment paper.
2. Roll the Dough: Roll out the dough on a floured surface to about ¼-inch thickness. Use a large heart-shaped cookie cutter or cut out heart shapes with a knife.
3. Fill the Calzones: Spoon 2-3 tablespoons of filling onto the center of half of the heart shapes, leaving a ½-inch border around the edges.
4. Seal the Calzones: Place a second dough heart over the filling. Press the edges together and crimp with a fork to seal.

Add the Finishing Touches:

1. Brush with Egg Wash: Brush the tops of the calzones with the egg wash and lightly brush with olive oil.
2. Vent the Calzones: Use a sharp knife to make two small slits on the tops of the calzones for steam to escape.

Bake and Serve:

1. Bake: Bake for 12-15 minutes, or until the calzones are golden brown.
2. Cool and Serve: Let the calzones cool for 5 minutes before serving.
3. Serve: Serve with warm marinara sauce for dipping.