Take 6 sheets out from the box. Keep them in a stack under a damp kitchen towel.
Roll up the remaining sheets and put them back in the box. Seal it and keep it in the fridge or freezer.
Take 3 sheets of phyllo pastry. Stack them up.
With the length of the pastry towards you, measure 5 inches and make a cut.
If the length of your pastry is shorter then measure 4 inches.
Using a pizza cutter or sharp knife, cut the pastry. You will have 3 strips of the pastry.
Cut each stack across. So now you will have 6 pieces of the stack.
Repeat the same with the remaining 3 sheets.
At this point preheat the oven to 180℃.
Brush the muffin tins lightly with the melted butter.
Now take one of that 5 inch stack, separate all 3 sheets. Brush one sheet lightly with butter, cover with another sheet. Brush that one too and cover with another sheet. Brush lightly with melted butter.
Take the stack and press it gently down into one of the muffin cup.
Take one part of the filling and fill the phyllo pastry with it.
Cover the filling with the overlapping pastry, by bringing the edges all to the middle. Press down gently.
Brush lightly with melted butter.
Repeat with the remaining stacks and filling.
Bake the spanakopita pies for 25-30 minutes or until the top of the pies is golden brown.
Remove the muffin tray from the oven.
Remove the pies carefully from the muffin tray.
Allow them to cool for 3-5 minutes.
Enjoy hot crispy spanakopita pies.