Microwave the cream cheese in 10-second bursts until soft. Whisk in the garlic powder, onion powder, egg, Parmesan, olive oil, and dried dill until smooth.
In a bowl, mix the chopped spinach with the crumbled feta. Season with salt and pepper.
Preheat your oven to 400°F. On a lightly floured surface, cut the puff pastry into 9 equal squares. Press each square into a greased muffin cup. Spoon a dollop of the creamy mixture, then top with the spinach mixture.
Gather the pastry corners over the filling and press gently to secure. Brush the tops with melted butter and bake for about 20 minutes until golden. Let cool for 10 minutes before serving.