
Mayonnaise is the surprise ingredient in these delicate, decadent, chocolatey cookies. They’re made with only 5 ingredients total, and the mayo gives the cookies the fat and stability of eggs, butter and oil. Bonus: the mayo also adds a special tangy flavor.
Preheat the oven to 400 degrees F. Line 2 rimmed baking sheets with parchment.
Whisk together the flour, sugar and cocoa in a large bowl. Add the mayonnaise and 1/4 cup water and stir until completely combined and there is no more dry flour visible; this will take a minute or two, but keep going and it will come together eventually. Stir in the chocolate chips.
Use a 1/4-cup (2-ounce) scoop to scoop the dough onto the prepared baking sheets. Bake until the cookies have spread and are just set at the edges, 12 to 14 minutes. Cool completely on the baking sheets.