Birthday Cake Blondies

Indulge in the irresistible charm of these gooey, sweet Funfetti Bars. They feature a tender chocolate chip cookie base, generously topped with fluffy marshmallows, delightful chocolate-covered pretzels, vibrant mini M&M’s, and a shower of colorful sprinkles. This ultimate loaded cookie bar recipe is designed to bring joy and a burst of flavor to any occasion.

Author’s Note

Mom’s Famous Loaded Cookie Bars: A Nostalgic Treat!

These loaded cookie bars hold a special place in my heart, truly having it all. They start with a wonderfully soft, chewy chocolate chip cookie base, providing the perfect foundation. Each bite delivers gooey, melted marshmallows, creating an incredibly satisfying texture. And, of course, they’re crowned with a generous pile of assorted candies and toppings.

Growing up, my mom frequently made these bars, and they were always an absolute sensation. Her Funfetti Bars became legendary among our family and friends, right alongside her famous Seven-Layer Bars and Caramelitas. The joy these treats brought was immeasurable, and sharing this recipe means sharing a piece of those cherished memories.

While my mom often opted for store-bought cookie dough for convenience – which works perfectly if you’re short on time – I’ve found that preparing the base from scratch elevates these Funfetti Bars to an entirely new level of homemade deliciousness. The extra effort is well worth it for the superior flavor and texture of a truly homemade chocolate chip cookie base.

Why You’ll Adore These Funfetti Bars

These aren’t just any dessert bars; they’re a celebration in every square! Here’s why these Funfetti Bars will quickly become a beloved addition to your recipe collection:

• Irresistibly Gooey Texture: The melted marshmallows create a delightfully chewy and gooey top layer that contrasts beautifully with the tender cookie base.
• Explosion of Flavors: You get the classic comfort of a chocolate chip cookie, the sweetness of marshmallows, the salty crunch of pretzels, and the colorful candy bursts from M&M’s and sprinkles.
• Visually Stunning: With their vibrant colors and varied textures, these bars are a feast for the eyes, making them perfect for parties, potlucks, and special occasions.
• Customizable Fun: Easily adapt the toppings and sprinkles to match any holiday, theme, or personal preference, making them versatile for year-round enjoyment.
• Simple to Make: Despite their impressive appearance, these bars are surprisingly straightforward to prepare, suitable for bakers of all skill levels.

Essential Ingredients for Perfect Funfetti Bars

Crafting the perfect Funfetti Bar begins with high-quality ingredients. Here’s a breakdown of what you’ll need and some expert tips for each component:

How To Make Funfetti Bars: A Simple Guide

Making these delightful Funfetti Bars is a fun and straightforward process. Follow these easy steps to create your own batch of loaded cookie goodness:

1. Prepare Your Pan and Oven: Begin by preheating your oven to 325°F (160°C). Line an 8×8-inch baking pan with parchment paper, leaving an overhang on two sides to easily lift the bars out later. This step is crucial, as the bars will be quite sticky once cooled.
2. Craft the Cookie Dough Base: In a large mixing bowl, use a hand mixer to cream together the room-temperature unsalted butter with the light brown sugar and granulated sugar until light and fluffy. Beat in the large egg and vanilla extract until well combined. Gradually add the baking soda, salt, and all-purpose flour, mixing until just incorporated. Finally, fold in the chocolate chips. The dough will be soft and slightly wet.
3. Bake the Golden Base: Press the cookie dough evenly into the bottom of your prepared pan. Bake for 19-23 minutes, or until the edges are lightly golden brown and the center appears firm, no longer glossy.
4. Melt the Marshmallow Topping: Remove the partially baked cookie base from the oven. Evenly sprinkle the mini marshmallows over the warm cookie layer. Return the pan to the oven for just 1 to 1.5 minutes, allowing the marshmallows to soften and become delightfully gooey, but not overly browned.
5. Add Your Dazzling Toppings: Immediately remove the pan from the oven and transfer it to a cooling rack. While the marshmallows are still warm and sticky, gently press in the mini M&M’s, coarsely chopped chocolate-covered pretzels, and a generous amount of sprinkles. Press them down lightly so they adhere to the melted marshmallow layer.
6. Cool and Slice with Precision: This step is critical for clean slices! Allow the Funfetti Bars to cool completely at room temperature for at least one hour. They taste fantastic warm, but will be incredibly messy if cut too soon. Once thoroughly cooled, use a hot, sharp knife (run under hot water and wipe dry between cuts) to slice them into individual bars. Enjoy your homemade masterpiece!

Expert Tips for Funfetti Bar Success

Achieve bakery-quality Funfetti Bars every time with these valuable insights and handy tricks:

• Precision with Flour: If you own a food scale, we strongly recommend weighing your flour (1 cup all-purpose flour typically equals 120-125 grams). This prevents adding too much flour, which can result in a dry or cake-like cookie base instead of the desired chewy texture.
• Patience is a Virtue (for Cooling): It’s tempting to dive into these bars while they’re still warm, but resist the urge! Allowing the Funfetti Bars to cool completely for at least an hour (or even longer) is essential for clean, well-defined slices. Warm bars will be wonderfully gooey but incredibly difficult and messy to cut.
• Fresh Marshmallows Make a Difference: For the best gooey texture and melt-in-your-mouth experience, use fresh, soft miniature marshmallows. Older, harder marshmallows won’t melt as smoothly and might not provide that signature chewy topping.
• Locating Mini M&M’s: If you’re having trouble finding mini M&M’s, look for them in the baking aisle of your grocery store. They are often labeled as “M&M’s milk chocolate baking bits.”
• Adjusting Sweetness: These bars are deliciously sweet, but if you prefer a less intense sweetness, opt for semi-sweet chocolate chips in the cookie base and consider reducing the amount of M&M’s or sprinkles on top.
• Room Temperature Ingredients: Always ensure your butter and egg are at room temperature. This allows them to emulsify better with the sugars, creating a smoother, more uniform dough and a superior texture in your finished cookie bars.
• Don’t Overbake the Base: Keep a close eye on your cookie base. Overbaking can lead to dry bars. The edges should be lightly golden, and the center set but not overly firm or glossy. Remember, it will continue to cook slightly once removed from the oven.

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Funfetti Bars

By
Chelsea Lords

Gooey and loaded with fun, these Funfetti Bars start with a chocolate chip cookie base topped with marshmallows, M&M’s, chocolate pretzels, and sprinkles—sweet, crunchy, and irresistible!

Prep Time:
10 minutes

Cook Time:
23 minutes

Rest Time:
1 hour

Total Time:
1 hour 33 minutes

Yield:
12 servings

Equipment

• 8 x 8-inch baking pan
• Hand mixer (or stand mixer with paddle attachment)
• Parchment paper
• Large mixing bowl
• Measuring cups and spoons

Ingredients

Cookie Bars

• 6 tablespoons unsalted butter, room temperature
• 1/2 cup light brown sugar, lightly packed
• 1/4 cup granulated sugar
• 1 large egg, room temperature
• 1 teaspoon vanilla extract
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1 cup + 2 tablespoons all-purpose flour
• 1 cup milk chocolate chips (or semi-sweet chocolate chips)

Toppings

• 1-1/2 cups miniature marshmallows
• 1/4 cup miniature M&M’s (see note 1)
• 3/4 cup chocolate-covered pretzels, coarsely chopped
• 2 tablespoons sprinkles (use festive colors for holidays!)

Instructions

1. Preheat oven to 325°F (160°C). Line an 8×8-inch pan with parchment paper, leaving an overhang on two sides (this helps tremendously with removal, do not skip—these bars are sticky!) and set aside.
2. In a large bowl, using a hand mixer (or stand mixer with paddle attachment), cream the room-temperature butter with the brown sugar and granulated sugar until light and fluffy. Beat in the egg and vanilla extract until well combined.
3. Add the baking soda, salt, flour, and chocolate chips to the wet ingredients. Beat on low speed until the dough is just combined and smooth. Be careful not to overmix. The dough will be a bit soft.
4. Press the dough evenly into the bottom of the prepared pan. Bake for 19–23 minutes, or until the edges are lightly golden brown and the center is set (it shouldn’t appear glossy).
5. Remove the pan from the oven and immediately top with the miniature marshmallows, spreading them evenly. Return to the oven for an additional 1 to 1.5 minutes, just until the marshmallows are puffed and slightly melted, but not browned.
6. Carefully remove the pan from the oven and transfer it to a wire cooling rack. While the marshmallows are still warm and tacky, generously press in the mini M&M’s, coarsely chopped chocolate-covered pretzels, and sprinkles. Gently press them down to ensure they adhere to the melted marshmallow layer.
7. Allow the Funfetti Bars to cool completely at room temperature for at least an hour. This step is essential for clean cutting. Once fully cooled, use a hot, sharp knife (run under hot water, wipe dry, cut, and repeat for each slice) to cut into 12 squares. These bars are best enjoyed within the same day due to the marshmallow topping.

Recipe Notes

Note 1: Mini M&M’s are typically found in the baking aisle of most grocery stores. They are often labeled as M&M’s milk chocolate baking bits.

Storage: If you happen to have any leftovers, these delightful Funfetti Bars can be stored, tightly covered, at room temperature for up to 3 days. For longer preservation, they can be kept in an airtight container in the refrigerator for up to a week. However, please note that the marshmallow topping may lose some of its original flavor and soft texture when refrigerated.

Nutrition Information

Serving: 1 serving |
Calories: 295 kcal |
Carbohydrates: 41 g |
Protein: 3 g |
Fat: 12 g |
Cholesterol: 35 mg |
Sodium: 73 mg |
Fiber: 1 g |
Sugar: 29 g

Nutrition information is automatically calculated and should only be used as an approximation.