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    Home » Recipes » Bars and Slices » Birthday Cake Blondies

    Birthday Cake Blondies

    Published: Dec 13, 2020 · Modified: Dec 14, 2020 by Erin · This post may contain affiliate links · 6 Comments

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    These soft and chewy Birthday Cake Blondies are filled with sprinkles and white chocolate chips. These Blondies are super easy to make and come together quickly, and are stuffed full of nostalgia.

    Top down bite shot of birthday cake blondies

    Table of contents

    • Birthday Cake Blondies
    • What are Blondies?
    • Even Better Brownies by Mike Johnson
    • Ingredients in Birthday Cake Blondies
    • How to Scale a Recipe
    • FAQ for Birthday Cake Blondies
    • A few wee tips for Birthday Cake Blondies
    • For more Bar recipes, check out:
    • Made this recipe and love it?

    Birthday Cake Blondies

    Hi! Just popping in here to share this new recipe with you from my friend Mike's book - Birthday Cake Blondies! These blondies are buttery, soft, and chewy, and are filled with rainbow sprinkles and white chocolate chips. They come together super quickly so are perfect if you need to throw something together to have in a pinch, or they are the best quick baking project if you are in need of something sweet.

    • side on stack shot of birthday cake blondies
    • corner shot birthday cake blondies

    What are Blondies?

    I'm not going to lie - I hadn't heard of blondies until I moved to the States, and even then I wasn't super familiar with them for a while! This is the first blondie recipe on the site but it certainly won't be the last, as I am totally hooked on how good they are. Blondies are basically the sister to brownies, but instead of being flavoured with chocolate and cocoa like brownies, they are vanilla flavoured! They still have all the good stuff brownies have - white and brown sugar, some oil, melted butter, egg, etc, but just minus the cocoa and melted chocolate. Mike amped it up one more step by adding in sprinkles and white chocolate for a nostalgic Birthday Cake situation. 

    Even Better Brownies by Mike Johnson

    This recipe for Birthday Cake Blondies comes from one of my best baking buddies, Mike! Mike runs the amazing blog MikebakesNYC, and is a super close friend of mine - we spend most work days texting back and forth with ideas and recipes, bouncing things off each other and cheering each other on. It's the best sort of friend to have and I am so grateful for our friendship, and just SO proud of his new book, Even Better Brownies!

    Mike's book is full of Brownie and Bar recipes, and is a must-own. He covers basically everything you can think of - there's cookie bars and blondies, a small batch brownie recipe, ice cream sandwich recipes, cheesecake, you name it. It's going to be a go-to book for me whenever I need brownie or bar recipe inspiration, and because it's Mike, each recipe is accompanied by the most beautiful photos. He also wrote it in a super short time period while working a FULL TIME JOB as a lawyer on the side. Just casually. The guy is amazing. Congrats Mike! I am so, so proud!

    • side shot birthday cake blondies
    • Bite shot of birthday cake blondies

    Ingredients in Birthday Cake Blondies

    Blondies are essentially brownies but without the chocolate - so the ingredient list is super similar!

    • Brown and White Sugar - Brown sugar gives fudginess to brownies, while white sugar provides chew. Both essential for blondies!
    • Melted Butter - Butter provides flavour and lift in these brownies, and helps the vanilla flavour to shine through.
    • Eggs - The blondies have that beautiful, crackly shiny top that you often see on brownies - this comes from beating the eggs together with the sugar until they are lightened in colour and have thickened. This aeration when baked up gives a paper thin finish to the blondie which is just so good!
    • Flour - Flour and baking powder give texture
    • Sprinkles and White Chocolate Chips - It wouldn't be birthday cake blondies without sprinkles! I used rainbow jimmies. Mike also popped some white chocolate chips in there for a super nostalgic vibe.
    • Vanilla - Mike calls for Imitation vanilla in this recipe, but I don't have any, so I subbed in some regular vanilla extract instead. Clear imitation vanilla will give you that real box mix birthday cake flavour if you're into that.
    side bite shot blondies

    How to Scale a Recipe

    Recipes that are made by weight can be easily doubled - the tricky part is working out what sized pan to use. The way that I work it out is like this - you work out the surface area of the pan that you are baking in (In this case 8"x8"=64 square inches), so for example a 9"x13" pan would have an area of 117 square inches, which is almost double 64, so if you doubled this recipe, baking it in a 9"x13" pan would work well. You would have to adjust the baking time slightly, but for pan conversion, this formula works well.

    • top down shot of birthday cake blondies
    • side on shot of blondie square

    FAQ for Birthday Cake Blondies

    What sort of sprinkles should I use for these blondies?

    Use Jimmies! The long, thin, waxy sprinkles. Don't use Non-pareils as they will bleed into the batter. Jimmies hold their shape when baking. Confetti sprinkles would work well too!

    Do I need an electric mixer for these?

    You don't! You should be fine with just a whisk. Just make sure that you mix the eggs and sugar together well until thick and lightened in colour.

    Can these be made ahead of time?

    These are great made ahead of time! Once they are cool, pop them into an airtight container.

    corner shot birthday cake blondies

    A few wee tips for Birthday Cake Blondies

    • Watch carefully when baking these - the line between underbaked and overbaked is quite thin. Check them after 30 minutes and give them an extra 2-3 if you think that they need it. You are looking for them to be golden brown and set on the top and edges.
    • Mike mentions putting half the chocolate chips on the top of the blondies before baking, but I folded them in instead and just added a few sprinkles on the top so that the chocolate didn't get too brown.
    • Mike calls for clear imitation vanilla in this recipe to get that real birthday cake vibe. I'm going to admit I'm not super into that, but if you are, then use the imitation stuff! I just used regular vanilla extract!
    Even better brownies by Mike Johnson

    For more Bar recipes, check out:

    • Black Cocoa Brownies with Oreo German Buttercream
    • Brown Butter Salted Caramel Slice
    • No-Bake Peppermint Slice
    • Peanut Butter Caramel Cheesecake Brownies

    Made this recipe and love it?

    I would LOVE for you to leave me a review below to let me know how you liked it! Make sure to tag me on Instagram if you make it!

    Print
    clock clock icon cutlery cutlery icon flag flag icon folder folder icon instagram instagram icon pinterest pinterest icon facebook facebook icon print print icon squares squares icon heart heart icon heart solid heart solid icon
    top down blondies photo

    Birthday Cake Blondies

    ★★★★★ 5 from 4 reviews
    • Author: Erin
    • Prep Time: 15 minutes
    • Cook Time: 35 minutes
    • Total Time: 50 minutes
    • Yield: 16 Bars 1x
    • Category: Blondies
    • Cuisine: American
    Print Recipe
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    Description

    These soft and chewy Birthday Cake Blondies are filled with sprinkles and white chocolate chips. These Blondies are super easy to make and come together quickly, and are stuffed full of nostalgia.


    Ingredients

    Scale
    • 180g All-Purpose Flour
    • ½ tsp kosher salt
    • 1 tsp baking powder
    • 115g unsalted butter, melted
    • 165g dark brown sugar
    • 100g granulated sugar
    • 2 large eggs, at room temperature
    • 1 Tbsp vanilla extract
    • 4 Tbsp rainbow sprinkles, plus 1 tsp for the top
    • 90g white chocolate chips

    Instructions

    1. Preheat the oven to 350°f / 180°c. Grease an 8"x8" (20cm x 20cm) square cake pan and then line with parchment paper, leaving an overhang on all sides. Grease the parchment paper then set aside. 
    2. In a medium bowl, combine the flour, salt, and baking powder. Set aside. 
    3. In a large bowl, whisk the melted butter, dark brown sugar, and granulated sugar together for about a minute. Add the eggs and vanilla and beat until lighter in colour, about 4 minutes (I used a handheld electric mixer). Gradually add the dry ingredients to the wet ingredients and mix until just combined. 
    4. Gently fold in the sprinkles and the white chocolate chips until evenly incorporated. Transfer the batter to the pan and top with the 1 tsp rainbow sprinkles. 
    5. Bake until the top and edges are set and golden, 30 to 35 minutes. Remove from the oven and allow the blondies to cool in the pan for 45 minutes before removing and slicing. 
    6. Cover and store leftover blondies in an airtight container at room temperature for 2 to 3 days. 

    Notes

    Recipe reprinted with permission from "Even Better Brownies" by Mike Johnson

    Keywords: Blondies, Birthday Cake Blondies, Funfetti Blondies, Sprinkle Blondies

    Did you make this recipe?

    Tag @cloudykitchen on Instagram and use the hashtag #cloudykitchen

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    Reader Interactions

    Comments

    1. stacy

      December 13, 2020 at 6:03 pm

      can't wait to try these!!

      ★★★★★

      Reply
    2. Mike Johnson

      December 14, 2020 at 4:09 pm

      Erin!!! This is the sweetest post ever and these photos came out BEAUTIFULLY 😍

      ★★★★★

      Reply
      • Erin

        December 14, 2020 at 8:51 pm

        Awwww thanks for writing the best book! <3

        Reply
    3. E

      December 25, 2020 at 5:49 am

      I regret making this only for one batch. Made it yesterday and all I have now is just crumbs.

      ★★★★★

      Reply
      • Erin

        December 25, 2020 at 9:04 am

        Hahahah yayyyyy! SO good right x

        Reply
    4. Alisha

      April 09, 2021 at 3:40 pm

      was looking for a solid blondie recipe, and since I always have great success with everything Cloudy Kitchen I gave these a try. They were PERFECT! I usually struggle with a too-gooey/underdone blondie but this gave the perfect lift, chew and yes still some yummy fudgy texture. I did add one experimental ingredient: MALTED MILK POWDER and woah! used 4 tablespoons (don't have the grams on this, sorry!) and the depth of flavor was incredible. Thank you Erin!

      ★★★★★

      Reply

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    I am originally from New Zealand but moved to Brooklyn, New York, six years ago. I live in a little wee apartment with my husband Rich, far too many house plants, and often a foster kitten or five... more

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