Whisk together the soy sauce, cornstarch, brown sugar, ginger, garlic, chili paste, and red pepper flakes. Set aside.
1/2 cup low-sodium soy sauce, 1 tablespoon corn starch, 1/2 teaspoon brown sugar, 2 cloves garlic, 1/2 tablespoon minced ginger, 1 - 2 teaspoons chili paste, 1/4 teaspoon red pepper flakes