Mushroom Tofu Potstickers

Name: Mushroom Tofu Potstickers
Ingredients: 3 cups cabbage, shredded on large holes of box grater; 8 ounces tofu (any firmness), crumbled; 4 ounces fresh shiitake mushrooms, stems removed, chopped; 2 cloves garlic, finely minced; 2 teaspoons grated fresh ginger; 1 tablespoon fresh basil, finely chopped; 2 tablespoons soy sauce; 1 package of 50 dumpling wrappers; 1 teaspoon cornstarch + 1/4 cup cool water; 3 tablespoons cooking oil, or more if needed