Flourless Fudge Cookies

Ingredients (6)

• + 3 cups confectioners' sugar add to pantry
• + ⅔ cup dark cocoa powder (such as Hershey's® Special Dark) add to pantry
• + ⅛ teaspoon salt add to pantry
• ✓ 2 egg whites, or more as needed
• + 1 tablespoon pure vanilla extract add to pantry
• + 1 ½ cups chocolate chips (60% cacao) add to pantry