Place all ingredients with the exception of the wonton skins in a large bowl. Using a clean hand, toss the ingredients until combined. Set aside.
Pour a small amount of water in a little bowl and take a wonton skin. Wet all the edges of the wonton skin using your finger. Place 1 heaping teaspoon of the filling in the center of the wonton skin and fold the skin in half to form a triangle. Wet the bottom two points with some water and bring them to meet in the center. Fold one point underneath the other and press to form a seal. Transfer the finished wonton to a baking sheet dusted with cornstarch. Repeat until you run out of filling or skins or both.
At this point, you can either cook your wontons right away or freeze them. If you choose to freeze them, simply place the baking sheet in your freezer for 1 hour. Once the hour has passed, remove the wontons from the sheet and place them in a large resealable freezer bag. The wontons will keep in the freezer for up to 1 month.