Preheat your oven to 375°F (190°C).

In a large mixing bowl, whisk together the flour, baking powder, salt, and black pepper.

Pour in the warm water and olive oil into the dry ingredients, stirring until a dough begins to form.

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

Roll the dough into a rectangle about 1/4 inch thick, dusting with flour as needed.

In a separate bowl, combine the shredded mozzarella, grated Parmesan, cream cheese, finely chopped vegetables, chopped parsley, and garlic powder, and mix thoroughly.

Spread the cheese mixture evenly over the rolled-out dough, leaving a small border.

Starting from one edge, tightly roll the dough into a log and cut into eight equal pieces.

Place the rolls on a greased baking sheet, brushing the tops with melted butter.

Bake for 20-25 minutes until golden brown and the cheese is melted.

Remove from the oven and let cool slightly on a wire rack before serving.