Birthday Cake Blondies

Updated March 19, 2024

Birthday Cake Blondies
Joseph De Leo for The New York Times. Food Stylist: Monica Pierini.
Total Time
35 minutes, plus cooling
Prep Time
5 minutes
Cook Time
30 minutes
Rating
4(212)
Notes
Read community notes

Think of these as a starter birthday cake to make for friends — they travel well and feel like a party wherever you’re handing them out. Despite the sheet of sprinkles coating the top, these blondies aren’t cloyingly sweet. The batter has just enough brown sugar for a gentle butterscotch richness and a good hit of salt. Toasted at the edges and chewy in the center, these bars also have tiny crackles of caramelized sprinkles throughout.

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Ingredients

Yield:One 8-inch pan (9 to 12 servings)
  • Butter, for greasing the pan
  • 1cup/130 grams all-purpose flour
  • ½teaspoon baking powder
  • ½teaspoon fine salt
  • 1cup/189 grams lightly packed light or dark brown sugar
  • ½cup/113 grams unsalted butter, softened
  • 1large egg
  • 1teaspoon vanilla extract
  • ¼cup sprinkles, plus more for the top (see Tip)
Ingredient Substitution Guide
Nutritional analysis per serving (12 servings)

194 calories; 9 grams fat; 5 grams saturated fat; 0 grams trans fat; 3 grams monounsaturated fat; 0 grams polyunsaturated fat; 28 grams carbohydrates; 0 grams dietary fiber; 20 grams sugars; 2 grams protein; 106 milligrams sodium

Note: The information shown is Edamam’s estimate based on available ingredients and preparation. It should not be considered a substitute for a professional nutritionist’s advice.

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Preparation

  1. Step 1

    Heat oven to 350 degrees with a rack in the center. Rub a pat of butter all over an 8-inch square baking pan.

  2. Step 2

    Whisk the flour, baking powder and salt in a small bowl.

  3. Step 3

    With a flexible spatula, stir the brown sugar and butter in a large bowl until smooth. Add the egg and vanilla, and stir vigorously until smooth again. Add the flour mixture and stir gently just until no floury streaks remain, then stir in ¼ cup/40 grams sprinkles.

  4. Step 4

    Spread the batter in the buttered pan into an even layer. Scatter sprinkles all over the top.

  5. Step 5

    Bake until golden brown and starting to pull away from the edges of the pan, about 25 minutes. Cool completely in the pan on a rack. Cut into squares or rectangles. The blondies will keep in an airtight container for up to 3 days at room temperature and 3 months in the freezer.

Tip
  • You can make these with any sprinkles you like. Shiny rainbow sprinkles may melt into the batter or bleed their color a bit on top, but should hold up. Matte sprinkles stay intact in the heat of the oven.

Ratings

4 out of 5
212 user ratings
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Cooking Notes

Chocolate chips, your favorite chopped nuts (especially pecans or walnuts) and flaked coconut are all delicious additions to blondies. Seasonally appropriate m&ms are also a festive touch. For an 8x8 pan you could add a cup total of the above and be very happy.

Hi Kelly, I topped with powdered sugar, cinnamon, & nutmeg for a snickerdoodle vibe. Was great.

The sprinkles are what make these "birthday cake" blondies. Leave them out, but then you're just making regular ol' blondies.

Blondies are also good with nuts. The favorite in my childhood home was chopped pecans.

These were delicious and so easy to make!

I also don't really like the taste of sprinkles, but have found that the more expensive brands tend to taste better - however, that's paying more for a whole bottle of something you have to "trial and error" and don't like much to begin with :) Alternately, Mini M&Ms would add a "pop" of color similar to sprinkles, if you're okay with that taste and the transformation of "birthday cake blondies" into Tiny M&M Blondies.

Made exactly as written, and they were perfect! To make my life easier, I creamed the butter and sugar with an electric mixer, then continued using the wooden spoon. They were crunchy on the outside and gooey on the inside. A great blondie.

This recipe was not good. I was excited to make it because of how easy it is. It also doesn't require a mixer. Mixing the softened butter and sugar with a spatula was not possible. I ended up using my hands like pie dough. It looked more like a cookie dough at the end. I could barely spread it into the pan. I kept checking the recipe to make sure I had the right ratio of ingredients because it was so off. The only change I made was using parchment paper on the pan.

Added chocolate chips and coconut per comments- definitely would again!

Baked this according to recipe. Ended up baking 35 minutes and thought I might have over baked them until cutting into them after they cooled and they were bordering on being under baked. Not a recipe I’ll be making again.

Followed the directions exactly and am very disappointed. The "batter" was quite thick, literally had to use a knife to spread it, and the finished blondies are quite chewy--and very sweet besides. Edible, but I'll stick with the Maple Walnut Blondies.

These were a hit at the party I brought them to (all adults). I used coarse salt because it’s all I had and actually found that the hit of salt was important to balancing these out.

I made these last night and added the one cup chocolate chips. I kind of wish I hadn’t. Next time I’ll try with just sprinkles. It’s a super simple recipe that is great for guests who aren’t dessert focused. I am so I already ate three. Hopefully I’ll have enough now:)!!

Need to make a gluten free dessert, would this work with gluten free flour?

I made these for my grandson as he loves anything with sprinkles. They took way longer to bake than indicated, and even though I reduced the amount of brown sugar, they were still way too sweet :-( Will not make these again.

I made these yesterday, and I was disappointed. I had the same issue with baking: 15 min longer than the recipe indicated. In retrospect, I used a newer glass pan. For some reason, Pyrex glass pans that are supposedly 8 inches are really only 6 inches on a side at the bottom. This will cause a longer baking time. I continue to pick up the old style pans at estate sales for this reason.

Altered recipe by increasing each of the following ingredients — flour by 1/3 Cup, baking powder by 1/2 Tsp., 1/2 Tsp. vanilla extract & adding 1/2 Cup butterscotch chips. I found a jar of pastel matte spring sprinkles & cooked on the center rack for 25 minutes. No problems seen with raw or uncooked centers & used a metal pan.

Added walnuts and chocolate chips

Very sweet.

I thought these were surprisingly good. They are, however pretty thin at only an inch, or slightly less, thick with a nice, chewy center.

Can you double for 9 by 12 pan?

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