In a liquid measuring cup, sprinkle the yeast over the warm water. Set aside for 5 minutes to bloom.
2. Step
In a bowl, add 3 cups (375 g) of the flour, Parmesan, baking powder, salt, and sugar, and stir to combine.
3. Step
Add 2 tablespoons of the olive oil and stir to combine. Pour the yeast water over the flour mixture and stir until the dough forms into a ball.
4. Step
Use remaining flour for dusting the surface. Scrape the dough out of the bowl onto your floured surface. Knead the dough for about 10 minutes until the dough is tight and form the dough into a ball.
5. Step
Pour 1 tablespoon olive oil in a bowl. Place the dough in the bowl.
6. Step
Cover, let rise for 1 hour in a warm area, or until the dough has doubled in size.
7. Step
Flour the surface. Flip bowl over surface and let the dough fall out of the bowl. Cut the dough into 2-inch (5-cm) pieces. Roll into balls.
8. Step
Begin forming the dough into a circle about ½-inch (1-cm) thick and 5 inches (12-cm) wide, making sure the middle of the circle is not too thin. Repeat with the other balls of dough.
9. Step
Spoon 1 tablespoon of tomato sauce on to the center of the dough.
10. Step
Sprinkle 2 tablespoons mozzarella, then 1 tablespoon basil. Season with salt.
11. Step
Fold the dough over the fillings and seal. Pinch the edge of the dough together and fold back. Repeat with the rest of the dough.
12. Step
Heat 2 inches (5 cm) of oil until the temperature reaches 365˚F (185˚C).
13. Step
Fry the calzones 2 at a time for about 3 minutes on each side. Remove from oil and drain on a paper towel-lined plate.
14. Step
Place a bowl filled with the rest of the tomato sauce on the plate.
