If you love the nostalgic taste of boxed birthday cake and frosting, these cookie–fudge sandwiches are about to become a favorite. Soft, round sugar cookies studded with rainbow jimmy sprinkles are paired with a rich, white chocolate birthday cake fudge center for a dessert that’s festive, colorful, and irresistibly creamy. They’re easy to make, fun to assemble, and guaranteed to bring instant party vibes to any occasion.
🎉 Birthday Cake Fudge Sandwiches
Equipment
- saucepan
- heatproof spatula or wooden spoon
- 8×8 inch baking pan
- Parchment paper
- Mixing bowls
- measuring cups
- Measuring spoons
- electric mixer or whisk
- Baking Sheets
- Cooling rack
- cookie scoop or tablespoon
- knife or cookie cutter
- Offset spatula
Ingredients
Birthday Cake Fudge
- 3 cups white chocolate chips
- 1 14 oz can sweetened condensed milk
- 2 tbsp unsalted butter
- 1 tsp birthday cake extract
- ¼ tsp almond extract optional, classic cake flavor
- ¼ tsp salt
- ½ cup rainbow sprinkles jimmies only
Soft Vanilla Sugar Cookies
- ½ cup unsalted butter softened
- ¾ cup granulated sugar
- 1 large egg
- 1½ tsp vanilla extract
- 1½ cups all-purpose flour
- ½ tsp baking powder
- ¼ tsp salt
- ½ cup jimmy sprinkles
Instructions
Make the Cookies
- Preheat oven to 350°F (175°C) and line baking sheets with parchment.
- Cream butter and sugar until light and fluffy.
- Beat in egg and vanilla.
- Mix in flour, baking powder, salt, and sprinkles just until combined.
- Scoop 1½ tablespoons of dough, roll into balls, and flatten slightly.
- Bake 9–11 minutes, until edges are set but centers are soft.
- Cool completely before assembling.
Make the Birthday Cake Fudge
- Line an 8×8-inch pan with parchment paper.
- In a saucepan over low heat, combine white chocolate chips, condensed milk, and butter.
- Stir constantly until fully melted and smooth.
- Remove from heat; stir in birthday cake extract, almond extract (if using), and salt.
- Let cool 1–2 minutes, then gently fold in sprinkles.
- Spread into prepared pan and chill 2–3 hours, until firm.
- Cut fudge into cookie-sized squares or rounds.
Assemble the Sandwiches
- Place one cookie flat-side up.
- Add one thick piece of fudge.
- Top with another cookie and gently press to sandwich.
- Optional: roll edges in extra sprinkles.
Notes
- Use jimmies-style sprinkles only; nonpareils tend to bleed color into the fudge.
- Stir the sprinkles in after the fudge cools slightly to keep colors vibrant.
- For clean cuts, chill fudge fully and use a warm, dry knife or cutter.
- Cookies must be completely cooled before assembling or the fudge will soften.
- For thicker sandwiches, cut fudge slightly smaller than the cookies so it doesn’t squeeze out.
- Store assembled sandwiches refrigerated in an airtight container for best texture.
- Let chilled sandwiches sit at room temperature 5–10 minutes before serving for optimal softness.
- Fudge alone can be made 1–2 days ahead and assembled later.
✨ Optional Upgrades
- Spread a thin layer of vanilla buttercream on cookies before adding fudge
- Dip half of each sandwich in melted white chocolate
- Tint fudge pastel pink or blue before chilling for a kawaii swirl
- Freeze sandwiches 15 minutes for an ice-cream-style bite
❓ FAQ
Can I use nonpareil sprinkles instead of jimmies?
It’s not recommended. Nonpareils bleed color and melt in both the cookie dough and fudge. Jimmy sprinkles (the long rod type) hold their shape and color best.
Do I have to use birthday cake extract?
No, but it gives the most authentic cake-batter flavor. You can substitute vanilla extract, though the flavor will be milder and less “birthday cake.”
Can these be made ahead of time?
Yes. You can bake the cookies and prepare the fudge up to two days in advance, then assemble the sandwiches the day you plan to serve them.
Will the fudge stay firm at room temperature?
The fudge will soften slightly but should hold its shape in a cool room. For warm environments, keep the sandwiches refrigerated until shortly before serving.
Can I make these smaller or larger?
Absolutely. Use a smaller scoop for bite-sized sandwiches or larger cookies for bakery-style treats—just cut the fudge to match the cookie size.
Can these be frozen?
Yes. Wrap each sandwich individually and freeze for up to one month. Thaw in the refrigerator or at room temperature before serving.
🌈 More Funfetti Cookie Ideas
If you love colorful, sprinkle-filled desserts, you’ll also enjoy these Rainbow Crunch Sugar Cookies. They’re packed with crunchy rainbow bits and are perfect for adding even more playful, birthday-party vibes to your dessert spread.
👉 Internal link:
https://sugarcloudbaking.com/2025/12/07/rainbow-crunch-sugar-cookies/
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