Funfetti Chocolate Chip Peanut Butter Cookie Bars

I made these for myself.


And for you. πŸ™‚

I am a firm believer in having birthday cake on your birthday. It doesn’t necessarily have to be cake, but there has to be at least something filling that place, whether it’s a pie, a giant cookie, or a box of donuts. (Candles are necessary as well.) It’s your day, you know!? You need cake to celebrate properly.


This past Friday was my birthday, and last week I had all these things planned out to bake just because I wanted to make them. And because I could get away with it, you know? πŸ˜‰ Last week also happened to be the busiest week ever. Like, rooftop parties, corporate office meetings, Southern Living + Coastal Living shindigs, and birthday festivities. Lots of stuff, but extremely fun stuff.

I ended up just making these cookie bars. I really can’t be disappointed because I don’t think I’ve ever eaten as much on a birthday as I ate on this one. Cupcake for breakfast, donut sitting on my desk when I arrived at work, this ridiculously incredible cheesecake, this loaded baked potato pizza, and a red velvet cake. (PS. I have awesome co-workers and the best friends in the history of the world.)


I definitely did not need these cookie bars. But I don’t make cookies very often, or cookie bars, and I was very inspired by all the wonderful cookie bars byΒ Averie Cooks! (She’s a genius, in case you didn’t know. But you probably did.) So much easier than chilling and scooping cookie dough! And cookies never turn out the way I want them to. But these were just as dense and soft as I wanted them to be.

I also wanted to make these cookie bars and use up some of the ingredients I already had in the pantry. I used some yellow cake mix, chocolate chips, peanut butter chips, and lots of rainbow jimmies. Β The peanut butter chips were definitely what these bars needed! Besides a giant glass of milk.


Funfetti Chocolate Chip Peanut Butter Cookie Bars


  • 1 stick butter, melted
  • 3/4 cup brown sugar
  • 1 egg
  • 1 tsp vanilla extract
  • 1/2 cup yellow cake mix
  • 1 cup whole wheat flour
  • 1/2 cup chocolate chips
  • 1/2 cup peanut butter chips
  • 1/2 cup rainbow jimmies


  1. Preheat oven to 350 degrees. Line an 8x8 inch baking pan with foil, leaving a 3-4 inch overhang. Spray foil with nonstick cooking spray.
  2. In a microwave safe bowl or measuring cup, melt butter in 30 second increments until melted. Let it cool for a few moments.
  3. Transfer melted butter to the bowl of a stand mixer (or a large bowl) and add the brown sugar, egg, and vanilla. Mix until incorporated.
  4. Add the cake mix. Then add half the flour. Mix until just combined. Repeat with the second half of the flour.
  5. Stir in chocolate chips, peanut butter chips, and rainbow jimmies.
  6. Pour the cookie dough into the prepared pan and spread it out with a rubber spatula.
  7. Bake for 30 minutes. Remove the pan from the oven and let it cool for 5 minutes. Once the foil is cool to the touch, use the foil overhangs and lift the cookie out of the pan. Place it on a wire rack to cool completely. (Or until it's just slightly warm.)
  8. Cut cookie into bars and eat!

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