Combine the potsticker sauce, soy sauce, Chinese mustard, and chili paste
Marinade the chicken for at least an hour or overnight
Heat the vegetable oil in a large skillet over medium heat
Place the chicken in the hot pan, skin-side down
Sear the chicken for about 10 minutes or until the skin is golden brown
Turn the heat down to medium-low and turn the chicken over and continue to cook until firm, about 15 minutes
Remove the chicken and let rest while the asparagus cooks
Turn the heat back to medium
Add the asparagus to the same skillet that the chicken was cooked in
Cook the asparagus until tender, the time will depend on the thickness of the asparagus. Ours were thin, so it only took 4 to 5 minutes
Cut the chicken into bite size pieces and serve with the asparagus over rice