Big Batch Confetti Cake

The kitchen still smelled like birthday magic even three days after my daughters party. I had foolishly attempted to make two separate cakes for twenty people and learned my lesson about baking smarter not harder. That weekend I developed this confetti cake recipe that bakes in big batch style but still tastes like something from a fancy bakery window. Now it is my go to for classroom parties office birthdays and those just because celebrations that make life sweeter.

Last summer I made this for our neighborhood block party and watched grown adults light up like little kids when they saw the speckled cake slices. Someone actually asked if I had ordered it from a bakery because the texture was so incredibly moist. The best moment was watching my neighbor cut herself a third piece while pretending she was just helping clean up.

Ingredients

• 4 cups (500 g) all-purpose flour: The foundation that gives this cake its tender crumb structure
• 2 ½ cups (500 g) granulated sugar: Sweetness that balances perfectly with the tangy buttermilk
• 1 tablespoon baking powder: Helps the cake rise tall and proud in the oven
• 1 teaspoon baking soda: Works with the acidic ingredients for extra lift
• 1 teaspoon fine sea salt: Enhances all the flavors without making it taste salty
• 2 cups (480 ml) whole milk at room temperature: Creates tenderness and richness that skim milk cannot achieve
• 1 cup (240 ml) vegetable oil: Keeps the cake incredibly moist for days
• 1 cup (226 g) unsalted butter melted and slightly cooled: Adds that unmistakable buttery flavor we all love
• 6 large eggs at room temperature: Structure builders that also contribute to richness
• 1 tablespoon pure vanilla extract: Do not skip or substitute this is the flavor backbone
• 1 cup (160 g) rainbow sprinkles (jimmies): Use jimmies not nonpareils to prevent color bleeding
• 2 cups (454 g) unsalted butter at room temperature: The secret to silky smooth buttercream that spreads like a dream
• 8 cups (960 g) powdered sugar sifted: Sifting prevents lumps and ensures velvet texture
• ½ cup (120 ml) whole milk at room temperature: Thins the frosting just enough for perfect spreading consistency
• 2 tablespoons pure vanilla extract: Makes the buttercream taste professionally delicious
• Pinch of salt: Cuts through all that sweetness to create balance
• ½ cup (80 g) rainbow sprinkles for decorating: The grand finale that makes everyone smile

Instructions

Preheat your oven:

Set it to 350°F (175°C) and grease two 9x13-inch pans with parchment paper so nothing sticks

Whisk the dry ingredients:

Combine flour sugar baking powder baking soda and salt in a large bowl

Mix the wet ingredients:

Whisk milk vegetable oil melted butter eggs and vanilla extract until completely smooth

Combine batters gently:

Pour wet into dry and mix just until combined

Add the magic:

Gently fold in sprinkles with a spatula until evenly distributed

Bake to perfection:

Divide batter between pans smooth tops and bake 30-35 minutes until a toothpick comes out clean

Cool completely:

Let cakes rest in pans 10 minutes then move to wire racks

Make the buttercream:

Beat butter 2 minutes until creamy then gradually add powdered sugar milk vanilla and salt beating 3 more minutes until fluffy

Frost and decorate:

Spread thick frosting on cooled cakes and top generously with sprinkles

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This recipe became legendary in my family after my brother claimed it was better than our childhood bakery birthday cake. He actually asked me to make it for his wedding shower instead of hiring a professional baker.

Making It Ahead

I have learned through many last minute baking marathons that this cake actually tastes better when made one day ahead. The flavors meld together and the sprinkles soften slightly creating an even more tender texture. Wrap the cooled unfrosted cakes tightly in plastic wrap and store at room temperature overnight.

Frosting Like A Pro

The secret to bakery style frosting is letting your butter come to true room temperature before beating it. Cold butter creates lumpy frosting and melted butter makes it too thin. I set my butter on the counter two hours before I plan to start baking.

Serving Suggestions

While this cake needs no accompaniment I have discovered that a glass of cold milk cuts through the richness perfectly. For adult celebrations try it with champagne or a sparkling rosé that highlights the vanilla notes.

• Sprinkle the top right before serving so they stay vibrant and bright
• Use a sharp knife dipped in hot water for clean cuts
• Store leftovers covered at room temperature for up to three days

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Every time I make this confetti cake I am reminded that the simplest celebrations are often the sweetest.

Recipe FAQs

→ Can I make the batter ahead of time?

Yes, you can prepare the batter up to 24 hours in advance and store it covered in the refrigerator. Let it come to room temperature for 20 minutes before baking. The sprinkles may bleed slightly if stored too long, so fold them in just before baking for best results.

→ What type of sprinkles work best?

Jimmies (the long cylindrical sprinkles) work best in the batter as they hold their shape and color during baking. Avoid nonpareils (the tiny ball sprinkles) in the batter—they'll bleed color and lose their crunch. Reserve nonpareils for decorating the top of the frosted cake.

→ How do I store leftover cake?

Store covered at room temperature for up to 3 days, or refrigerate for up to a week. Bring to room temperature before serving for the best texture and flavor. You can also freeze individual squares wrapped tightly for up to 3 months.

→ Can I make this as a layer cake instead?

Absolutely. Divide the batter between three 9-inch round pans and reduce the baking time to 25-30 minutes. You may need to increase the frosting quantity to fill and frost between layers. Let the cakes cool completely before assembling.

→ Why does my buttercream feel too thick or thin?

If too thick, add milk one teaspoon at a time until creamy. If too thin, gradually add more powdered sugar. Room temperature ingredients are crucial—the butter should be soft but not melted, and milk should be at room temperature for proper emulsification.

→ Can I substitute the all-purpose flour?

Cake flour will make an even lighter, more tender crumb. Use the same amount but reduce slightly by 2 tablespoons. For whole wheat, substitute up to half the all-purpose flour—the cake will be denser with a nuttier flavor.