In a large bowl, combine the first 7 ingredients. Place 1 tablespoon beef mixture in center of each pot sticker wrapper. (Cover wrappers with a damp towel until ready to use.), Moisten wrapper edges with egg. Fold wrapper over filling; seal edges, pleating the front side several times to form a pleated pouch. Stand pot stickers on a work surface to flatten bottoms; curve slightly to form crescent shapes, if desired., In a large skillet, heat 1-1/2 teaspoons sesame oil over medium-high heat. Arrange half of the pot stickers in concentric circles in pan, flat side down; cook 1-2 minutes or until bottoms are lightly browned. Carefully add 1/4 cup water (water may spatter); reduce heat to medium. Cook, covered, 3-5 minutes or until water is almost absorbed and filling is cooked through., Cook, potstickers, uncovered, 1-2 minutes or until bottoms are crisp and water is completely evaporated. Repeat with remaining pot stickers.