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close up of Oreo Brownie with buttercream frosting sitting on a white plate

100th Anniversary Oreo Brownies

  • Author: Elizabeth @ Confessions of a Baking Queen
  • Prep Time: 10
  • Cook Time: 25
  • Total Time: 35 minutes
  • Yield: 16 Brownies 1x
  • Category: Dessert
  • Method: Bake
  • Cuisine: American


Chewy and Fudgy Brownies topped with a homemade buttercream and Oreos. You will love this extra special 100th anniversary Oreo brownies recipe. 




  • 1 Box of Fudge Brownies (9X13 Size)
  • 1/4 Cup of water
  • 2/3 Cup of vegetable oil
  • 2 eggs
  • 1 cup of crushed Oreo's
  • 1/4 Cup of sprinkles


  • 1 1/2 Cups unsalted butter at room temp.
  • 3 Cups of powdered sugar
  • 2 Teaspoons vanilla extract
  • 1/8 Cup of sprinkles
  • Broken Oreo's for the top of brownies


  1. Preheat oven to 350F and grease a 13X9 baking pan. 
  2. In any bowl mix together brownie mix, water, oil, and eggs. Once combined fold in Oreo's and sprinkles. 
  3. Bake for 25 minutes or until a toothpick inserted comes out clean. Once out of the oven use a knife to loosen edges. Place pan on a rack to cool.
  4. Once brownies are cool, whip butter in a bowl of an electric mixer for 2-3 minutes until it's nice and fluffy.
  5. Add the powdered sugar and vanilla extract. Cream till nice and smooth. Then, add sprinkles. 
  6. You can pipe the frosting with a unique tip or just use a Ziploc bag or piping bag with no tip. Or even spread it with a knife! You can be done there or add an Oreo or half of one to the top of the brownie for more yummy-i-ness! 🙂 

Keywords: oreo brownie recipe, oreo dessert recipe, cookies and cream brownies

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