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Brown Butter Birthday Cake Blondie

Prep Time: 20 mins
Cook Time: 35 mins
Total Time: 55 mins
If you love Milk Bar’s Birthday Cake, you NEED to try this decadent Brown Butter Birthday Blondie recipe asap! The nutty aroma of the brown butter complements the sweet vanilla and white chocolate of the chewy blondie perfectly. The flavor is rich and satisfying, the texture is soft and gooey, making each bite an absolute delight for your taste buds.


  • 9 x 13 inch baking pan
  • Parchment paper
  • Whisk
  • Silicone spatula
  • Large mixing bowl
  • Scale


  • 226 salted butter (browned)
  • 205 g brown sugar
  • 80 g granulated sugar
  • 2 eggs + 1 yolk
  • 2 tsp vanilla extract
  • 1/2 tsp baking powder
  • 1 tsp salt
  • 2 tsp cornstarch
  • 280 g all-purpose flour
  • 80 g sprinkle
  • 100 g white chocolate


  1. Pre-heat the oven to 350°F (175°C). Grease and line a 9×13 inch baking pan with a parchment paper.
  2. In a medium saucepan, melt the salted butter over medium heat, stirring frequently, until the salted butter turns golden brown and gives off a nutty aroma. Remove from heat and let cool slightly.
  3. In large mixing bowl – add the browned butter, granulated sugar and brown sugar, using a whisk, mixed until combined.
  4. Beat in the eggs, one at a time, then stir in the vanilla extract and salt, mixed until well combined.
  5. Using a sifter, sift in all-purpose flour, cornstarch and baking powder. Using a spatula, fold in the ingredients until just combined.
  6. Add in sprinkles and diced white chocolate, and fold with a spatula until combined.
  7. Add your batter to your already greased and lined pan, and flatten them out with a spatula. Bake at 350°F (175°C) for  35 minutes, or until a toothpick inserted into the center comes out clean.
  8. Let cool in the pan for 10-15 minutes before transferring to a wire rack to cool completely. Slice into bars and serve.

Rated 4.9 out of 5
4.9 out of 5 stars (based on 23 reviews)
Very good9%

Simply adorable!

Rated 5.0 out of 5
April 22, 2023

Oh my goodness, the Brown Butter Birthday Cake Blondie recipe is simply adorable! The golden brown color, the sprinkles, and the decadent taste of brown butter all come together to make the perfect birthday treat.

The new look of the website where the recipe is located? It’s absolutely awesome! The recipes are now easier to find and the site is more accessible than ever before. I love how everything is organized and the images are simply gorgeous. It’s one of the best recipe sites I’ve ever seen, hands down.

Overall, I would highly recommend both the Brown Butter Birthday Cake Blondie recipe and the website itself. They are both cute, fun, and oh so delicious!

Emily Johnson

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