Strawberry Funfetti Cake Buttercream

My daughter's seventh birthday party taught me that children notice the smallest details. She'd been talking about a rainbow cake for months, so I decided to surprise her with something that felt like pure joy baked into a pan. When I pulled those two layers out of the oven, the smell of butter and vanilla filled the whole house, but it was the specks of colorful sprinkles peeking through that made everyone gather around the counter. Even now, years later, the sight of rainbow jimmies makes me smile.

I made this cake last spring for my book club, and it disappeared so fast that someone actually asked if there was a second one hidden somewhere. Watching grown women get excited about sprinkles was unexpectedly delightful. The buttercream alone has become my go-to frosting for almost everything now.

Ingredients

• All-purpose flour: The foundation that gives structure while keeping everything tender, so measure by weight if you can for consistency
• Baking powder: What makes those layers rise tall and proud, so check the expiration date if it has been sitting in your pantry for a while
• Salt: Just enough to balance and enhance all the sweetness without anyone tasting it directly
• Unsalted butter: Room temperature is non-negotiable here because cold butter creates stubborn lumps that ruin the texture
• Granulated sugar: Creaming this with the butter creates tiny air pockets that make the cake light and fluffy
• Eggs: Room temperature eggs emulsify better into the batter, creating a more uniform crumb structure
• Whole milk: Adds moisture and richness while helping create that tender velvety texture we all want
• Fresh strawberries: Finely chopped so they distribute evenly throughout the batter instead of sinking to the bottom
• Pure vanilla extract: Worth the extra cost because the fake stuff never quite tastes right in something this special
• Rainbow sprinkles: Stick to jimmies rather than nonpareils because the tiny balls bleed color everywhere and look messy
• More butter for frosting: Again, make sure it is softened properly or you will end up with lumpy buttercream
• Powdered sugar: Sifting first prevents those annoying little clumps that never quite beat out smooth
• Strawberry puree: Blend and strain fresh berries for the smoothest incorporation without fruit chunks in your frosting
• Pinch of salt: Even frosting needs a tiny bit to keep the sweetness from becoming overwhelming
• Milk or cream: Only if needed to thin the frosting to the perfect spreadable consistency

Instructions

Get everything ready:

Preheat your oven to 350°F and grease two 8-inch round pans with butter, then line the bottoms with parchment paper so nothing sticks

Whisk the dry ingredients:

In a medium bowl, combine the flour, baking powder, and salt so they are evenly distributed before you start mixing anything else

Cream the butter and sugar:

Beat them together on medium-high speed for 3 to 4 minutes until the mixture turns pale and fluffy, scraping down the sides halfway through

Add the eggs:

Drop them in one at a time, letting each fully incorporate before adding the next, then stir in the vanilla extract

Combine everything:

With the mixer on low, add the flour mixture in three parts, alternating with the milk, starting and ending with the flour until just combined

Fold in the fun stuff:

Gently add the chopped strawberries first, then carefully fold in the sprinkles by hand so the colors do not bleed into the batter

Bake the layers:

Divide the batter evenly between the pans, smooth the tops, and bake for 28 to 32 minutes until a toothpick comes out clean

Cool completely:

Let the cakes rest in the pans for 10 minutes, then turn them onto wire racks to cool all the way through before frosting

Make the frosting:

Beat the butter until creamy, gradually add the powdered sugar, then mix in the strawberry puree, vanilla, and salt until smooth

Assemble the cake:

Place one layer on your serving plate, spread with buttercream, top with the second cake, and frost the top and sides

Add the finishing touch:

Scatter extra sprinkles on top if you want to lean into the celebration vibe

Save

This has become my default birthday cake, mostly because the combination of real strawberry flavor and whimsical sprinkles hits some perfect note between sophisticated and playful. Last time I made it, my neighbor asked for the recipe before she even finished her first slice.

Making Strawberry Puree

I have learned that blending and straining fresh strawberries creates the smoothest puree for both the cake and frosting. The seeds can make the buttercream feel gritty, so taking the extra minute to push the mixture through a fine mesh strainer makes all the difference in the final texture.

Room Temperature Ingredients

Cold ingredients are the enemy of tender cakes. When I first started baking, I would rush and use cold butter or milk straight from the fridge, and my cakes always turned out denser than I wanted. Now I set everything out on the counter at least an hour before I plan to start baking.

Storage and Serving

This cake stays surprisingly moist for the first two days, which is convenient because you can bake it the day before a party without any loss of quality. The buttercream actually benefits from sitting overnight because the strawberry flavor has time to develop and deepen.

• Store at room temperature for the first day if your kitchen stays cool
• Refrigerate after that, but bring slices to room temperature before serving
• The sprinkles might bleed slightly into the frosting over time, which actually looks pretty

Save

There is something about cutting into a cake that looks like a celebration that makes even ordinary Tuesdays feel special. Hope this recipe brings as much joy to your kitchen as it has to mine.

Recipe FAQs

→ Can I use frozen strawberries instead of fresh?

Yes, frozen strawberries work well. Thaw completely and drain excess liquid before chopping to prevent the batter from becoming too watery.

→ How far in advance can I make this cake?

The cake layers can be baked and frozen for up to 1 month. The frosted cake tastes best within 2 days but keeps refrigerated for up to 4 days. Bring to room temperature before serving.

→ What type of sprinkles work best for funfetti?

Jimmies-style rainbow sprinkles hold their color best during baking. Avoid nonpareils or pearl sprinkles as they may bleed color into the batter.

→ Can I make this as cupcakes?

Absolutely! The batter yields about 24 cupcakes. Reduce baking time to 18–22 minutes at 350°F. Frost with the same strawberry buttercream.

→ How do I prevent the sprinkles from bleeding color?

Gently fold sprinkles into the batter at the very end, mixing just until combined. Over-mixing causes colors to bleed and streak throughout the cake.

→ Can I make the buttercream ahead of time?

The strawberry buttercream can be made 1–2 days ahead and stored refrigerated in an airtight container. Bring to room temperature and re-whip before frosting.