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Brownie Batter Cookies with Mars Chocolate Bars Recipe Piled up on a table

Brownie Batter Cookies with Mars Chocolate Bars

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Whether you’re a brownie or cookie person, you can have both and you’ll love these chocolate-filled treats. These easy-to-make Brownie Batter Cookies use Mars Chocolate Bars for an indulging, delicious chewy goodness inside with a crunchy texture on the outside.
Course Desserts
Cuisine Tradicional
Keyword brownie batter cookies, Brownie cookies, chocolate cookie, cookie recipe, Mars Bar Chocolate brownie cookie, Mars Bar recipe
Prep Time 10 minutes
Cook Time 12 minutes
Total Time 22 minutes
Servings 18
Author Camila Rojas
Cost 15


  • 3.5 Oz of unsalted butter {100 gr}
  • ¾ cup of white sugar
  • ¾ cup of semi-sweet chocolate chips
  • 1 tbs espesso powder
  • 2 to 3 regular bars of Mars Bar chocolate chopped.
  • 2 large eggs
  • 3/4 cup of all purpose flour
  • 1 tsp of baking soda
  • ¼ tsp of salt
  • 1 tsp vanilla extract


  • First of all pre-heat the oven to 350ºF {180ºC}
  • In a mixing bowl, put the butter and the chocolate chips and take them to the microwave for 2-3 minutes {depending on your microwave potency}.
  • About half time stir and put it back.
  • It should be ready when it’s completely melted and smooth.
  • If you don’t have a microwave you can always go for “bain-marie or double bath” {hot water bath}.
  • Then stir the sugar, salt, and vanilla and mix well.
  • Let it cool for a few minutes so it doesn’t cook the eggs.
  • Then start adding the eggs. These should be added one at a time mixing well until they are completely incorporated.
  • Then add the flour and baking soda and stir strongly with preferably a wooden spoon. It gets very hard so you have to put a lot into it.
  • Mix until the batter is smooth and shiny – don’t overmix.
  • Lastly, add the mars bar chunks and mix.
  • In a baking tray, spray some butter and place about a spoon per cooky.
  • Make sure to leave space so when they grow, they don’t stick together.
  • Bake for about 10-12 minutes or until you see them slightly cracked and puffed up.
  • Take them out so they still are soft and gooey. The key here is to slightly underbake them.
  • Let the cookies cool for a few minutes on the hot cookie sheet, then transfer them to a cooling rack.


They will get thinner and a bit crunchier on the outside when they cool down but are still soft inside and with melted caramel from the Mars chocolate bars.
I love eating them fresh right off the cookie sheet so they are still a bit warm and gooey…. drooling here!