Squash Pot Stickers

Name: Squash Pot Stickers
Ingredients: 1 pound butternut squash, peeled and seeded, flesh cut into 1/2-inch pieces; 1/2 cup plus 2 tablespoons soy sauce; 3 tablespoons packed brown sugar; 1/4 teaspoon salt; 2 scallions, white and pale-green parts only, thinly sliced; 1 teaspoon grated peeled fresh ginger; 1/4 teaspoon sesame seeds; 20 wonton wrappers, thawed if frozen; 1/4 cup canola oil