Mom's Best Recipes
Recipe

Vanilla Smash Cake

A soft 6-inch vanilla smash cake with lightly sweet yogurt frosting that is easy to spread, easy to decorate, and built for the cutest mess.

Author By Matt Campbell
4.8
A small frosted 6-inch vanilla smash cake on a white cake stand on a bright kitchen table, topped with fresh berries
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Smash cake is one of my favorite kinds of baking because it is not about perfection. It is about a tiny human, a tiny cake, and the very real possibility that frosting will end up in an ear. Love that for us.

This recipe makes a classic 6-inch vanilla smash cake with a tender, fluffy crumb and a simple Greek yogurt frosting that is creamy, not tooth-achingly sweet, and spreads like a dream. The ingredients are normal grocery store stuff, the steps are straightforward, and the end result photographs beautifully even if your frosting job is a little “abstract art.”

Flour, sugar, eggs, butter, Greek yogurt, vanilla, and baking powder arranged with measuring spoons ready for baking

Why It Works

  • Soft, tender cake: A mix of butter, oil, and buttermilk keeps the crumb plush and smashable.
  • Lightly sweet frosting: Greek yogurt plus whipped cream makes a fluffy, tangy topping that is easy to spread.
  • Small batch, low drama: Two 6-inch layers bake quickly and cool fast, which means less waiting and less fuss.
  • Make-ahead friendly: Bake the layers a day early, wrap, chill, and assemble when you are ready.

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Storage Tips

Fridge: Store leftover cake in an airtight container for up to 3 days. That said, yogurt and whipped-cream style frostings are happiest in the first 1 to 2 days before they start to soften or weep.

Freezer (cake layers only): Wrap unfrosted layers tightly in plastic wrap, then foil. Freeze up to 1 month. Thaw overnight in the fridge, then frost.

Note: Yogurt frosting does not freeze great. It can get a little grainy when thawed, so I recommend freezing just the cake.

Common Questions

Is smash cake safe for babies?

Babies are different, so check with your pediatrician if you have concerns. This cake is lightly sweet and uses everyday ingredients like flour, eggs, dairy, and vanilla. For baby-specific safety, serve with close supervision, skip hard toppings (like dragée-style sprinkles), and cut berries into baby-safe pieces to reduce choking risk. If your child has allergies or is still working through common allergen introductions (egg, dairy, wheat), swap accordingly or choose a frosting that fits their needs.

Can I make this with no added sugar?

You can reduce sugar, but completely removing it changes texture and browning. For a lower-sugar version, start by reducing the granulated sugar in the cake to 1/2 cup and see how you like it. The cake will be a bit less tender and less golden, but still tasty.

What is the best size pan for a smash cake?

A 6-inch round is the sweet spot. This recipe is written for two 6-inch (ideally 6x2-inch) pans to make a cute little layer cake.

No 6-inch pans? You can use one 8-inch pan and bake as a single layer. Because the layer will be thinner, start checking at 18 minutes and go from there.

How far ahead can I make a smash cake?

Bake the layers up to 1 day ahead. Wrap and refrigerate. Frost the day of for the cleanest look. You can also frost a few hours ahead and chill until party time.

My yogurt frosting looks runny. How do I fix it?

First, make sure your yogurt is Greek yogurt and not regular. If it is still loose, chill the bowl for 20 to 30 minutes. For a thicker, more yogurt-forward fix, strain the yogurt in cheesecloth (or a coffee filter) for 30 to 60 minutes, then mix again.

You can also whip in 2 to 4 tablespoons of powdered sugar to help it set up. If you are okay changing the flavor and adding more dairy, a few tablespoons of softened cream cheese adds structure, but it does change the frosting and allergen profile.

Do I need food coloring or fancy piping tips?

Nope. A simple swoopy frosting finish looks adorable. Fresh berries, sliced strawberries, or a few soft sprinkles do the job without turning this into a whole project.

The first time I helped make a smash cake, I learned two truths: babies do not care about perfect frosting, and adults absolutely do. Now I build smash cakes like I cook most things: keep it simple, make it taste great, and accept that the best part is the moment everything gets a little messy. If you end up with frosting on the high chair, the floor, and somehow the dog, congrats. You nailed it.