Heat some olive oil in a pan. Add in onion, red bell pepper and cook until they're soft. Add a pinch of salt.
Add in the minced beef, Worcestershire sauce and continue cooking until the meat is fully cooked. Adjust seasoning if needed. Transfer to a bowl and leave to cool completely.
Once cooled, add in shredded mozzarella, dry parsley, garlic powder and cream cheese. Mix everything together.
Divided the dough into 8 equally sized balls. Take 1 ball and flatten it. Place 1 full tablespoon of the filling in the center. Pinch the seams together and form into a ball. Place in a greased 9 inch (23 cm)round pan. Repeat the same steps with the rest of the balls.
Cover them loosely with cling film and leave them around 30 minutes, just for them to puff up a bit. Brush the top with some melted butter and garlic powder mixture.
Baking
Bake them at 200°C (400°F) preheated oven for 20-30 minutes or until golden brown and fully cooked. Leave to cool a bit before serving.