Preheat your oven to 375°F (190°C).

In a large mixing bowl, combine the flour, baking powder, salt, and black pepper. Whisk until well blended, then gradually add warm water and olive oil.

Transfer the dough to a floured surface and knead for about 3-4 minutes until smooth and elastic.

Roll the kneaded dough into a rectangle approximately 1/4 inch thick.

In a separate bowl, mix together the shredded mozzarella, grated Parmesan, cream cheese, mixed vegetables, parsley, and garlic powder.

Spread the filling mixture evenly over the rolled-out dough, leaving an inch border on all sides, then roll tightly.

Cut the rolled dough into 8 equal pieces and place on a greased baking sheet.

Melt butter and brush it on top of each roll.

Bake the rolls for 20-25 minutes until golden brown.

Once baked, allow them to cool for a few minutes before serving.