In a small bowl, dissolve the sugar in the warm water and sprinkle the yeast on top. Let it sit for 5-10 minutes until frothy.
In a large bowl, mix the flour and salt.
Make a well in the center and pour in the yeast mixture and vegetable oil (or melted butter).
Stir to combine and then knead the dough on a floured surface for about 5-7 minutes until smooth and elastic.
Place the dough in a lightly oiled bowl, cover with a cloth, and let it rise in a warm place for about 1 hour, or until doubled in size.
In a medium bowl, combine the grated cheese, chopped onion, bell pepper, cooked bacon or ham (if using), and fresh herbs.
Season with salt and black pepper to taste. Mix well.
Preheat your oven to 375°F (190°C).
Punch down the risen dough and divide it into 8-10 equal portions.
Roll each portion into a flat circle on a floured surface.
Spoon a portion of the filling onto one half of each dough circle, leaving a border around the edges.
Fold the dough over the filling to create a half-moon shape and press the edges to seal.
Place the filled dough on a baking sheet lined with parchment paper.
Bake in the preheated oven for 15-20 minutes, or until golden brown and crispy.
Enjoy your meal!