In a mixing bowl, combine warm water and yeast. Let it sit for 5 minutes until frothy.

Add flour, salt, and sugar to the yeast mixture. Mix until a dough forms.

Knead the dough on a floured surface for about 5 minutes until smooth.

Cover the dough with a cloth and let it rise in a warm place for 15 minutes.

Preheat the oven to 400°F (200°C).

Roll out the dough on a floured surface to about 1/4 inch thick.

Cut the dough into circles, about 4 inches in diameter.

Place a tablespoon of mozzarella cheese and a few pepperoni slices on one half of each circle.

Fold the dough over to create a pocket and seal the edges with a fork.

Place the pizza pockets on a baking sheet lined with parchment paper.

Bake in the preheated oven for 15-20 minutes until golden brown.

Remove from the oven and let cool slightly before serving with pizza sauce.