Preheat your oven to 375°F (190°C).

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

Pour in the warm water and olive oil into the dry mixture. Stir until the dough starts to come together.

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

Using a rolling pin, flatten the dough into a rectangle about 1/4 inch thick.

In a separate bowl, blend the mozzarella, parmesan, cream cheese, mixed vegetables, parsley, and garlic powder until combined.

Spread the filling evenly over the rolled-out dough and roll into a tight log, then slice into 8 equal pieces.

Line a greased baking sheet with parchment paper. Place the sliced rolls cut side up and brush with melted butter.

Bake for 20-25 minutes until golden brown and puffed up, with cheese oozing out.

Let the rolls cool for a few minutes before serving warm.