Easy Birthday Cake Blondies
Celebrate with a batch of birthday cake blondies! This super easy sweet treat has pops of rainbow sprinkles and white chocolate chips in every bite. Bake a batch for a friend’s birthday and I promise they will be asking for the recipe!
Blondies are the best because they are basically a vanilla version of a brownie. They’re soft, chewy and sweet with a strong vanilla flavor. I love this recipe because you don’t need to pull our the electric mixer. The batter comes together in mere minutes! You’ll be asking everyone when their birthday is just as an excuse bake a batch of these blondies.
Why You’ll Love This Recipe
- Celebratory treat! Whether it’s a birthday, anniversary or another special occasion, these bars will make the event feel extra special!
- Reliable recipe. This is an adaptation of my classic blondie recipe, but with a colorful birthday twist.
- No special equipment needed. This recipe doesn’t need an electric mixer—just a mixing bowl!
- Quick and easy to make. The batter comes together in minutes, then it’s just bake and cool before enjoying.
- Versatile. I love this recipe because you can swap out the sprinkles for different holidays.
Ingredient Notes
- Flour: All purpose flour is used as the base for the dry ingredients. Remember to measure the flour properly.
- Baking powder: This leavening agent helps the batter rise and become soft.
- Salt: To help offset the sweetness and activate the baking powder, salt is added to the dry ingredients.
- Butter: Use unsalted butter that is melted. Different brands of salted butter have various amounts of salt added so it’s best to add it separately.
- Sugar: To add moisture and sweetness, granulated sugar is used.
- Brown sugar: Light or dark brown sugar may be used to add a chewy texture and sweetness.
- Egg: Use a room temperature egg to help bind the ingredients.
- Vanilla: Pure vanilla extract adds a nice warm flavor to these dessert bars.
- Sprinkles: For a pop of celebratory color, mix in some rainbow sprinkles!
- White chocolate chips: Every good blondie has white chocolate chips! I prefer Ghirardelli.
Refer to the recipe card with ingredient details and measurements.
Recipe Variations
Make a double batch. Serving a crowd? Double the recipe and bake it in a metal 9×13 pan. Baking time will be closer to 30 minutes.
Try different mix-ins. You can use any color sprinkles depending on the occasion (red and green for Christmas!) If you’re not a fan of white chocolate, swap out the white chocolate chips for semisweet or butterscotch.
Add some frosting. Use my vanilla buttercream recipe to add a sweet layer of frosting on top of the cooled bars.
How to Make Birthday Cake Blondies
- Whisk together the dry ingredients—flour, baking powder and salt. Set aside.
- Mix the melted butter, sugar and brown sugar together until light in color. Add the egg and vanilla, then mix until combined.
- Add the dry ingredients to the wet ingredients. Mix just until combined. Stir in the white chocolate chips and sprinkles.
- Transfer batter to a parchment-lined 8×8 baking pan. Spread into an even layer. Bake at 350 F for 25 to 28 minutes or until a toothpick inserted in the center comes out with little to no crumbs. Cool completely before cutting.
Expert Tips
Don’t over-mix the batter. When combining the ingredients, mix just until combined. Over-mixing causes dense and tough baked goods.
Use a metal baking pan. For even heat distribution, use a light-colored metal baking pan. Glass pans retain heat longer and cause the edges of the blondies to over-bake.
Measure the flour properly. A kitchen scale it best for accuracy, but if you don’t have a scale you can use the spoon and level method. Don’t pack flour down into the cup.
Storage Tips
Store in an airtight container at room temperature for up to 5 days. Make sure blondies are completely cooled to avoid condensation.
Freeze for up to 3 months. Wrap bars in plastic wrap and aluminum foil to prevent freezer burn. Store in the freezer, then defrost in the refrigerator before bringing to room temperature.
Recipe FAQ
Most likely there was too much flour added. Use a kitchen scale for accuracy or try the spoon and level method. Spoon the flour into a measuring cup and level with a knife (don’t pack it into the measuring cup).
I have not tested this, but I believe the batter will spread too much. Instead, try my sprinkle sugar cookie recipe and mix in 1 cup white chocolate chips.
Yes, but the baking time will be shorter, around 20 to 25 minutes.
Related Recipes
Try out these other celebratory recipes!
Did you love this recipe? Please leave a 5-star 🌟🌟🌟🌟🌟 rating in the recipe card below and if you REALLY loved it, consider leaving a comment further down the page.
Get the Recipe: Easy Birthday Cake Blondies
Ingredients
- 1 cup (125 g) all-purpose flour
- ½ teaspoon baking powder
- ½ teaspoon kosher salt
- ½ cup (1 stick or 113 g) unsalted butter, melted and cooled
- ¾ cup (150 g) packed light brown sugar
- ¼ cup (50 g) granulated sugar
- 2 teaspoons pure vanilla extract
- 1 large egg, room temperature
- ¾ cup (120 g) white chocolate chips
- ¼ cup rainbow sprinkles
Instructions
- Preheat the oven to 350°F. Line an 8-inch by 8-inch pan with parchment paper and set aside.
- In a medium bowl, whisk together flour, baking powder and salt. Set aside.
- In a large bowl, whisk together melted butter, brown sugar and granulated sugar until combined. Add egg and vanilla and mix well. Add the flour mixture and stir just until combined (careful not to overmix). Fold in white chocolate chips and sprinkles.
- Transfer batter to prepared baking pan and spread into an even layer. Bake for 25 to 28 minutes or until a toothpick inserted into the center comes out clean. Cool and cut into squares and serve.
