Soft Funfetti Birthday Cake Cookies with Rainbow Sprinkles

Why You’ll Love This Recipe

• All the nostalgic flavor of funfetti birthday cake in a soft, chewy cookie.
• A mix of vanilla and almond extract gives that classic bakery birthday-cake aroma.
• Rainbow sprinkles stay bright and visible, with just the right amount in every bite.
• Dough chills quickly and bakes in minutes, perfect for parties, bake sales, or last-minute celebrations.

Grocery List

• Produce: None
• Dairy: Unsalted butter, large eggs, milk (whole or 2%)
• Pantry: All-purpose flour, cornstarch, baking powder, baking soda, fine salt, granulated sugar, light brown sugar, vanilla extract, almond extract, rainbow jimmies sprinkles, white chocolate chips (optional)

Full Ingredients

Funfetti Birthday Cake Cookies

• 2 1/2 cups (300 g) all-purpose flour, spooned and leveled
• 2 tsp cornstarch
• 1 tsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp fine sea salt (or table salt)
• 3/4 cup (170 g) unsalted butter, softened to cool room temperature
• 3/4 cup (150 g) granulated sugar
• 1/2 cup (100 g) packed light brown sugar
• 1 large egg, room temperature
• 1 large egg yolk, room temperature
• 1 1/2 tsp pure vanilla extract
• 1/2 tsp almond extract
• 2 tbsp milk (whole or 2%; optional but helps keep cookies extra soft)
• 3/4 cup (135 g) rainbow jimmies sprinkles (the long, rod-shaped kind; not nonpareils)
• 1/4 cup (45 g) white chocolate chips or chunks (optional, but delicious)
• 2–3 tbsp extra rainbow jimmies, for pressing on top before baking (optional but pretty)

Step-by-Step Instructions

Step 1: Prepare your pans and gather ingredients

Line 2 large baking sheets with parchment paper. If you do not have parchment, lightly grease the pans instead. Set aside.

Make sure your butter is softened (it should give slightly when pressed, but not be greasy or melting) and your eggs are at room temperature. Measure out all ingredients before you start for a smoother process.

Step 2: Mix the dry ingredients

In a medium bowl, whisk together the flour, cornstarch, baking powder, baking soda, and salt until well combined and no streaks remain. This helps distribute the leaveners evenly so the cookies rise uniformly and stay tender. Set the bowl aside.

Step 3: Cream the butter and sugars

In a large mixing bowl (or the bowl of a stand mixer fitted with the paddle attachment), add the softened butter, granulated sugar, and brown sugar.

Beat on medium-high speed for 2–3 minutes, scraping down the sides of the bowl as needed, until the mixture is noticeably lighter in color and looks fluffy. Proper creaming helps create soft, slightly thick cookies with a chewy center.

Step 4: Add eggs, extracts, and milk

Add the egg and egg yolk to the creamed butter mixture. Beat on medium speed just until fully incorporated, about 30–45 seconds. Do not overmix here.

Add the vanilla extract, almond extract, and milk (if using). Mix again until the batter is smooth and creamy. At this stage, the mixture should smell like classic birthday cake.

Step 5: Combine wet and dry ingredients

Add the dry ingredient mixture to the wet ingredients in two additions. Mix on low speed after each addition, stopping as soon as you no longer see dry flour. Overmixing at this stage can make the cookies tough, so keep it brief.

If any dry spots remain, finish gently folding with a spatula, scraping down the sides and bottom of the bowl to ensure an even dough.

Step 6: Fold in the sprinkles (and chips)

Sprinkle the rainbow jimmies over the dough, and add the white chocolate chips if using. Using a spatula or wooden spoon, fold them in by hand just until evenly distributed. Be gentle to avoid breaking the sprinkles or streaking color into the dough.

Cover the bowl tightly with plastic wrap or a reusable lid and refrigerate the dough for at least 30 minutes. This brief chill time helps prevent excessive spreading and improves flavor and texture.

Step 7: Portion and bake the cookies

Near the end of the chilling time, preheat your oven to 350°F (175°C) with a rack placed in the center.

Use a medium cookie scoop or a tablespoon to portion out about 1 1/2 tablespoons of dough per cookie (about 30–32 g each). Roll each portion into a smooth ball and place on the prepared baking sheets, leaving about 2 inches (5 cm) between cookies for spreading.

If you like a bakery-style look, press a few extra sprinkles (and a couple of white chocolate chips, if using) gently into the tops of each dough ball.

Bake, one sheet at a time, for 10–12 minutes, or until the edges are just set and lightly golden but the centers still look slightly underbaked and puffy. The cookies will continue to set as they cool.

Step 8: Cool and serve

Remove the baking sheet from the oven and let the cookies cool on the pan for 5–10 minutes. This helps them firm up without drying out.

Transfer cookies carefully to a wire rack to cool completely, or enjoy them slightly warm for the gooiest, chewiest texture. Serve as-is, or pair with a glass of cold milk for the full birthday-cake experience.

Pro Tips

• Use jimmies, not nonpareils. The long, rod-style sprinkles (jimmies) hold their color and shape in the oven. Nonpareils tend to bleed and can turn the dough grayish.
• Do not overbake. Pull the cookies when the centers still look a bit soft and pale. They will set as they cool and stay chewy instead of turning dry.
• Chill for thicker cookies. A 30-minute chill is the minimum; for even thicker, more flavorful cookies, chill the dough for 2–24 hours.
• Weigh your flour if possible. Too much flour makes cookies cakey and dry. Using a kitchen scale (300 g) or spoon-and-level method prevents this.
• Rotate pans for even baking. If baking two sheets at once, swap their positions halfway through baking to ensure even browning.

Variations

• White chocolate birthday-cake cookies: Add a full 1 cup (175 g) of white chocolate chips for extra sweetness and a creamy contrast to the sprinkles.
• Confetti sandwich cookies: Once cooled, sandwich two cookies around a layer of vanilla buttercream or cream cheese frosting for an over-the-top birthday treat.
• Gluten-free twist: Substitute a good-quality 1:1 gluten-free baking flour blend for the all-purpose flour. Chill the dough at least 1 hour for best structure.

Storage & Make-Ahead

Store completely cooled cookies in an airtight container at room temperature for up to 4 days. To keep them extra soft, you can tuck a small piece of bread or a marshmallow into the container (replace it as it dries out).

For make-ahead dough, chill the covered bowl of dough for up to 48 hours. Alternatively, scoop the dough into balls, freeze on a baking sheet until firm, then transfer to a freezer bag for up to 2 months. Bake from frozen at 350°F (175°C), adding 1–2 minutes to the baking time as needed.

Nutrition (per serving)

Approximate for 1 cookie (1/24 of batch), including optional milk but excluding white chocolate chips: about 170 calories, 7 g fat, 4 g saturated fat, 25 g carbohydrates, 15 g sugars, 2 g protein, and 120 mg sodium. With white chocolate chips, add roughly 15–20 calories and 1 g fat per cookie. Values are estimates and will vary based on exact ingredients and cookie size.