No-Sugar-Added Berry First Birthday Cake

A first birthday cake that’s soft, naturally sweet, and made without any added sugar. This little berry cake uses ripe banana and juicy berries for flavor, so you can feel good about serving it to your baby and the whole family.

The batter comes together in one bowl, bakes into a tender crumb, and gets topped with a simple yogurt frosting. It’s the kind of cake that works for a smash session and a casual slice after dinner.

Why This Cake Works for a First Birthday

Most store-bought cakes are loaded with sugar and ingredients you can’t pronounce. This one relies on banana and berries for sweetness, giving it a mild, fruity taste that babies love. The crumb stays soft and moist for days, thanks to yogurt and butter.

I’ve tested it with both fresh and frozen berries, and it turns out every time. The yogurt frosting adds a tangy finish without any sweetener, and you can make the cake a day ahead so party prep is one less thing to worry about.

Ingredients

• 1 cup (120 g) whole wheat pastry flour: soft and fine, gives a tender crumb. All-purpose works too.
• 1 tsp baking powder: helps the cake rise gently.
• 1/4 tsp baking soda: reacts with the yogurt for lift.
• 1/8 tsp fine sea salt: brings out the fruit flavor.
• 1 large very ripe banana: mashed, you’ll need about 1/2 cup.
• 1 large egg: at room temperature.
• 2 tbsp melted unsalted butter: or refined coconut oil for dairy-free.
• 1 tsp vanilla extract: use pure if you have it.
• 1/3 cup plain full-fat Greek yogurt: the thick kind, adds moisture.
• 1/2 cup fresh or frozen mixed berries: small blueberries, chopped raspberries, or chopped strawberries.

Variations / Substitutions

• Dairy-free: use melted refined coconut oil and a thick plain coconut yogurt. The cake stays moist and the frosting sets up well.
• Flour swap: all-purpose flour can replace the whole wheat pastry flour one-for-one. The crumb will be slightly more delicate.
• Spice it up: add 1/4 tsp cinnamon or a pinch of nutmeg to the dry ingredients for a warmer note.
• Different berries: any small or chopped berry works. Avoid large whole strawberries unless you cut them into small pieces.
• Frosting variation: for a pink hue, blend a few raspberries into the yogurt before spreading.

Soft Strawberry Smash Cake is another reader favorite dessert worth making next.

How to Make Berry First Birthday Cake

Step 1: Mash the Banana and Mix the Wet Ingredients

Mash the 1 large banana in a medium mixing bowl with a fork until smooth and no lumps remain, about 1 minute. Add the 1 egg, 2 tbsp melted butter, 1 tsp vanilla, and 1/3 cup yogurt. Whisk until the mixture is evenly combined and pale yellow.

The batter will be thick and a little lumpy from the banana, which is exactly what you want. Don’t worry if a few small pieces of banana are visible; they’ll bake into soft pockets.

Step 2: Whisk the Dry Ingredients

In a small bowl, stir together the 1 cup flour, 1 tsp baking powder, 1/4 tsp baking soda, and 1/8 tsp salt until no streaks remain, about 30 seconds. This ensures the leaveners are evenly distributed.

Using whole wheat pastry flour gives the cake a light, nutty crumb without any heaviness. If you only have all-purpose flour, the cake will still turn out tender.

Step 3: Fold the Batter Together

Add the dry ingredients to the wet mixture and fold gently with a rubber spatula just until you no longer see streaks of flour, about 10 to 12 strokes. Gently fold in the 1/2 cup berries right at the end, taking care not to crush them.

The batter will look thick and speckled with fruit. Overmixing can make the cake tough, so stop as soon as the flour disappears. If using frozen berries, there’s no need to thaw them; fold them in straight from the freezer to keep their shape.

Step 4: Bake the Cake

Preheat the oven to 350°F (180°C). Scrape the batter into a 6-inch round cake pan that you’ve lined with parchment paper and lightly greased. Smooth the top with the spatula. Bake for 22 to 25 minutes, until the top is golden and a toothpick inserted in the center comes out clean.

The kitchen will smell like warm banana bread. The cake may dome slightly in the middle, but it will settle as it cools. Let the cake cool in the pan on a wire rack for 10 minutes, then turn it out and cool completely before frosting.

Step 5: Frost and Serve

Once the cake is completely cool, spread 1/2 cup plain full-fat Greek yogurt over the top with a small offset spatula or the back of a spoon. Pile a handful of fresh berries on top for a pretty finish.

The yogurt frosting stays soft and creamy, so it’s best to frost just before serving. If you need to make the cake ahead, store the unfrosted cake at room temperature and frost it when you’re ready to sing happy birthday.

A Few Tips for a Great Smash Cake

• Use a banana with plenty of brown spots. The riper it is, the more natural sweetness it brings.
• Grease the pan well and line the bottom with parchment. The fruit can make the cake a little sticky, and this helps it release cleanly.
• Let the cake cool completely. A warm cake will melt the yogurt frosting and slide right off.
• For cleaner slices, pop the frosted cake in the fridge for 10 minutes before cutting.

Bake times by pan size:

Keeping the Cake Fresh

Refrigerate leftover cake in an airtight container for up to 2 days. Bring it to room temperature before serving so the cake softens back up. The yogurt frosting stays best chilled, but the cake itself tastes more tender when it’s not straight from the fridge.

Frequently Asked Questions

Can I make this cake egg-free?

Yes, replace the egg with 1 tablespoon ground flaxseed mixed with 3 tablespoons water. Let it sit for 5 minutes to thicken, then use it in the wet mixture. The texture will be slightly denser, but it still holds together well.

Can I use regular yogurt for the frosting?

Not without a little extra work. Regular yogurt is too thin and will run off the cake. If that’s all you have, strain it through a cheesecloth for a few hours until it’s thick like Greek yogurt.

Can I double the recipe for a larger crowd?

Absolutely. Double all the ingredients and bake the batter in an 8-inch round pan. Start checking for doneness at 28 minutes, and add a few extra minutes as needed until a toothpick comes out clean.

My baby is over 12 months, can I add a little sweetness?

Yes. You can whisk 1 to 2 tablespoons of pure maple syrup into the wet ingredients. It adds a gentle sweetness without overwhelming the fruit.

Berry First Birthday Cake Recipe

Print Recipe Pin Recipe

Prep Time 10 minutes mins

Cook Time 25 minutes mins

Total Time 35 minutes mins

Servings: 6 servings

Calories: 137

Ingredients Method Notes

Ingredients

  

• 1 cup (120 g) whole wheat pastry flour
• 1 tsp baking powder
• 1/4 tsp baking soda
• 1/8 tsp fine sea salt
• 1 large very ripe banana
• 1 large egg
• 2 tbsp melted unsalted butter
• 1 tsp vanilla extract
• 1/3 cup plain full-fat Greek yogurt
• 1/2 cup fresh or frozen mixed berries

Method

 

1. Mash the banana in a bowl until smooth, then whisk in the egg, melted butter, vanilla, and yogurt.
2. In a small bowl, stir together the flour, baking powder, baking soda, and salt.
3. Fold the dry ingredients into the wet mixture until just combined, then gently fold in the berries.
4. Pour the batter into a parchment-lined 6-inch cake pan and bake at 350°F (180°C) for 22 to 25 minutes, until a toothpick comes out clean. Cool completely.
5. Spread Greek yogurt over the cooled cake, top with fresh berries, and serve.

Notes

If your banana isn’t very ripe, you can leave the cake plain or add a tiny drizzle of maple syrup to the batter. The cake tastes best the day it’s made, but you can bake it a day in advance and frost it right before the party.