Chewy Gooey Flourless Chocolate Cookies

Bahan-bahan (24 porsi)

• 3 cups powdered sugar
• ⅔ cup Dutch Process cocoa powder
• ¼ teaspoon salt
• 2 to 4 large egg whites, (at room temperature)
• 1 tablespoon vanilla extract
• 1½ cups bittersweet chocolate chips