To make wrapper, in large bowl (either regular mixing bowl or bowl of electric mixer), mix together flour, salt, and matcha powder. Add water and oil and stir to combine, or use dough hook on electric mixer (if using). Remove from bowl and knead for about 3 to 5 minutes, until you have smooth, soft dough. If dough is too sticky, add flour, 1 Tbsp at a time. If dough is too dry, add water, 1 Tbsp at a time. Form a ball, wrap in reusable cling film alternative, and let rest, refrigerated, for 30 minutes.