I've halved the following recipe which yield 20 wrappers
Gyoza Wrapper Recipe
via justonecookbook
Author: Namiko Chen
Serves: 42-44 wrappers (thin wrappers)
Ingredients
240gm plain flour
½ tsp. salt
120 ml just-boiled water plus more if necessary (should be around 120 - 150 ml)
You will also need:
3" (8 cm) cookie cutter
While for the filling, I've just followed a rough guide from this video.