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overhead of six of the best chocolate chunk cookies made from just one egg yolk and all brown sugar

One Yolk Chocolate Chunk Cookies

Six chewy chocolate chunk cookies made with just one egg yolk, loaded with bits of dark chocolate and ready in 20 minutes.
Course Dessert, Snack
Prep Time 10 minutes
Cook Time 10 minutes
Servings 6


  • stand mixer to cream the dough


  • 43 g or 3 tablespoons European-style salted butter, (if using a different butter, see notes), softened to room temperature
  • 65 g light brown sugar 1/3 cup
  • 1 teaspoon pure vanilla extract
  • 1 large egg yolk
  • 1/4 teaspoon baking soda
  • 75 g all purpose flour if you prefer flatter cookies, use 65g, about 1/2 cup (if you measure by cup, shake the flour around first and sprinkle it in then level it, don't over pack the cup. Too much flour will cause the cookies to not spread.)
  • 100 g or about 2/3 cup chopped dark chocolate Use less if you don't like a lot of chocolate. Do not sub with chocolate chips.


  • Preheat oven to 360 F. Line a quarter sheet pan (or a half) with parchment paper.
  • In a bowl, use a hand mixer to beat together the butter and brown sugar on medium until light and fluffy, at least 3 minutes.
  • Add the soda and vanilla and beat for another two minutes.
  • Add the egg yolk, beat for one minute.
  • Add the flour and beat to just combine. Fold in the chocolate.
  • Divide dough into six equal balls. If you use a cookie scoop you’ll get the pretty ridges, use a 1 1/2 tablespoon size, slightly heaped. Place on cookie sheet. Sprinkle with sea salt if desired.
  • Bake for 10 minutes, don’t wait for them to get color on top or they will be overdone. Allow to cool on the pan before moving. Store in an airtight container.