Pin Recipe Soft, chewy blondie bars bursting with rainbow sprinkles, a hint of soda flavor, and a buttery crumbly streusel topping are perfect for celebrations or a colorful treat anytime.
I made these blondie bars for my niece's birthday party and they stole the show—everyone loved the whimsical colors and the buttery streusel topping. Even the adults came back for seconds, asking about the secret ingredient in the batter.
Ingredients
- Unsalted butter: 1/2 cup (115 g), melted and slightly cooled
- Light brown sugar: 1 cup (200 g), packed
- Egg: 1 large
- Vanilla extract: 1 tsp
- Lemon-lime soda: 1/4 cup (60 ml), e.g. Sprite or 7UP
- All-purpose flour: 1 1/4 cups (160 g)
- Baking powder: 1/2 tsp
- Salt: 1/4 tsp
- Rainbow sprinkles: 1/2 cup (90 g)
- Granulated sugar: 1/3 cup (70 g)
- All-purpose flour (for streusel): 1/4 cup (30 g)
- Unsalted butter (for streusel): 2 tbsp (30 g), melted
- Lemon-lime soda (for streusel): 1 tbsp (15 ml)
- Salt (for streusel): Pinch
- Rainbow sprinkles (for streusel): 2 tbsp (20 g)
Instructions
- Prepare pan:
- Preheat the oven to 350°F (175°C). Line an 8x8-inch (20x20 cm) baking pan with parchment paper, leaving an overhang for easy removal.
- Mix wet ingredients:
- In a medium bowl, whisk together melted butter and brown sugar until smooth. Add the egg and vanilla extract and whisk until combined.
- Add soda:
- Stir in the lemon-lime soda.
- Mix dry ingredients:
- In a separate bowl, whisk together flour, baking powder, and salt. Gradually fold the dry mixture into the wet, mixing until just combined. Do not overmix.
- Add sprinkles:
- Gently fold in rainbow sprinkles.
- Transfer batter:
- Spread the batter evenly into the prepared pan.
- Make streusel:
- In a small bowl, combine granulated sugar, flour, melted butter, lemon-lime soda, and a pinch of salt. Mix with a fork until crumbly. Stir in sprinkles.
- Add streusel:
- Sprinkle the streusel evenly over the blondie batter.
- Bake:
- Bake for 26–28 minutes, until the edges are set and a toothpick inserted in the center comes out with a few moist crumbs.
- Cool and cut:
- Allow to cool completely in the pan on a wire rack. Lift out using the parchment and cut into 16 bars.
Pin Recipe My family loves sharing these bars at our game nights—kids and adults alike reach for the biggest, sprinkle-packed piece. The blondies have become our go-to for festive occasions and bake sales.
Required Tools
Use an 8x8-inch (20x20 cm) baking pan, mixing bowls, a whisk, spatula, measuring cups and spoons, and parchment paper to make these bars easily and with minimal clean-up.
Allergen Information
Contains wheat (gluten), eggs, and dairy (butter). Sprinkles may contain traces of soy or nuts: please check packaging if allergies are a concern.
Nutritional Information
Each bar contains approximately 185 calories, 7 g total fat, 29 g carbohydrates, and 2 g protein.
Pin Recipe Enjoy these funfetti bars fresh with a scoop of vanilla ice cream for ultimate indulgence. The festive look and chewy texture will brighten any celebration.
Recipe FAQs
- → Can I use different sodas for the streusel?
Absolutely! Orange soda or other flavors work well and add a unique twist to the bars.
- → How do I store the bars after baking?
Keep them in an airtight container at room temperature for up to 4 days, or refrigerate for up to a week.
- → What’s the secret to chewy texture?
Using melted butter and not overmixing the batter results in soft, chewy blondies.
- → Can I make this gluten-free?
Try using a 1:1 gluten-free flour blend, but check sprinkles for gluten content.
- → Is there a way to enhance lemon flavor?
Add up to 1/2 tsp lemon zest for a brighter citrus note in the batter.
- → Do I need special sprinkles?
Use any rainbow sprinkles, but check labels for allergens like soy or nuts if needed.