Naturally Sweetened Strawberry First Birthday Cake

A tender, fruit-sweetened cake made with fresh strawberries and ripe bananas that feels just right for a first birthday. No refined sugar, no fuss, just a soft crumb that holds up to a little hand grabbing it.

It’s straightforward to mix together the morning of the party, and the cake is sturdy enough to take a thin layer of cream cheese frosting if you want to dress it up for photos.

Why This Cake Works for a First Birthday

Most first-birthday cakes are either loaded with sugar or dry and crumbly. This one stays moist from the bananas and Greek yogurt, with a natural sweetness that tastes like actual strawberries, not just pink coloring.

It’s soft enough for a baby to pick up and squish, but holds together when you slice it. I keep coming back to this version because it’s the one I actually want to eat alongside the little ones.

Ingredients

• 1 cup (120 g) whole wheat flour: all-purpose works too, just gives a lighter crumb
• 1 tsp baking powder
• ½ tsp baking soda
• 1 medium ripe banana (about ½ cup mashed): the riper, the sweeter
• 1 cup (150 g) fresh strawberries, hulled and finely chopped: plus a few slices for the top
• ¼ cup (60 g) plain Greek yogurt: full-fat or 2%
• 1 large egg: room temperature
• 2 tbsp avocado or vegetable oil
• 1 tsp vanilla extract

Variations / Substitutions

• Use all-purpose flour: swap it in 1:1 for a lighter texture, though you lose a bit of the nutty whole wheat flavor.
• Make it dairy-free: replace the Greek yogurt with the same amount of full-fat coconut yogurt.
• Try other berries: raspberries or finely chopped blueberries work just as well.
• Add a cream cheese frosting: beat 4 oz softened cream cheese with 2 tbsp plain yogurt and 1 tbsp mashed strawberry until smooth, then spread over the cooled cake.

Strawberry Sheet Cake is another reader favorite dessert worth making next.

How to Make Strawberry First Birthday Cake

Step 1: Mash and Mix the Wet Ingredients

Preheat the oven to 350°F (180°C) and grease an 8-inch round cake pan with a little oil, then line the bottom with parchment paper. In a large bowl, mash the banana until mostly smooth, then whisk in the ¼ cup yogurt, 1 egg, 2 tbsp oil, and 1 tsp vanilla until the mixture looks creamy and uniform.

You’ll have a pale, slightly lumpy liquid that smells softly of banana and vanilla. A few small banana flecks are fine; they keep the cake tender.

Step 2: Stir the Dry Ingredients

In a separate bowl, whisk together the 1 cup flour, 1 tsp baking powder, and ½ tsp baking soda so the leaveners are evenly distributed. Sprinkle the dry mixture over the wet banana mixture and stir with a spatula just until no dry streaks remain.

The batter will be thick but not stiff, and you’ll see it start to bubble slightly from the baking soda reacting with the yogurt. Stop mixing as soon as the flour disappears so the cake stays light.

Step 3: Fold in the Strawberries

Add the 1 cup chopped fresh strawberries to the bowl and gently fold them in with a few broad strokes. You want the berry pieces scattered throughout without crushing them or overworking the batter.

The bright pink chunks against the pale batter look promising right now, and the batter will feel heavy but still loose enough to drop off the spatula.

Step 4: Bake the Cake

Scrape the batter into the prepared pan and spread it level with the spatula. If you like, dot a few thin strawberry slices on top for color. Bake on the middle rack for 20 to 22 minutes, until the top turns golden around the edges and a toothpick inserted in the center comes out clean or with a few moist crumbs.

The kitchen will smell like warm strawberries and banana bread. Let the cake cool in the pan for 10 minutes before running a knife around the edge and turning it out onto a rack.

Step 5: Cool and Slice the Cake

Let the cake cool completely on the rack before you slice it, about 30 minutes more. If you planned on a frosting, spread it on now while the cake is completely cool so it doesn’t melt. Cut into 8 wedges and serve at room temperature, straight off the plate.

The crumb will be soft and amber-tinted, with little pockets of fruit showing through each slice.

Tips for the Best Smash Cake

• Use very ripe bananas: with plenty of brown spots for the most natural sweetness without any added sugar.
• Chop the strawberries small: so they distribute evenly instead of sinking to the bottom. Pieces about the size of a pea work best.
• Don’t overmix: once you add the flour, or the cake can turn out dense and gummy instead of tender.
• If gifting or traveling, bake the cake a day ahead and keep it covered at room temperature. The flavor settles and the crumb stays moist.

Bake times by pan size:

Storing the Cake

• Refrigerate: leftover slices in an airtight container for up to 3 days. Bring to room temperature before serving so the texture relaxes.
• Freeze: the whole cooled cake or individual slices wrapped well for up to 2 months. Thaw overnight in the fridge.

Frequently Asked Questions

Can I use frozen strawberries?

Yes. Thaw them first and drain off any excess liquid, then chop and fold them in. The added moisture can extend the bake time by a minute or two.

Can I make this cake dairy-free?

Replace the Greek yogurt with full-fat coconut yogurt. The flavor stays mild and the crumb remains moist.

Can I skip the egg?

You can swap in 1 tablespoon of ground flaxseed mixed with 3 tablespoons of water. Let it sit for 5 minutes to thicken before using. The cake will be slightly denser.

My cake sunk in the middle, why?

That usually happens when the batter is overmixed or the oven door is opened too early. Mix just until the flour disappears and resist the urge to check before the 18-minute mark.

Strawberry First Birthday Cake Recipe

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 22 minutes mins

Total Time 37 minutes mins

Servings: 8 servings

Calories: 111

Ingredients Method Notes

Ingredients

  

• 1 cup whole wheat flour
• 1 tsp baking powder
• ½ tsp baking soda
• 1 medium ripe banana (about ½ cup mashed)
• 1 cup fresh strawberries, hulled and finely chopped
• ¼ cup plain Greek yogurt
• 1 large egg
• 2 tbsp avocado or vegetable oil
• 1 tsp vanilla extract

Method

 

1. Preheat oven to 350°F and prepare an 8-inch round pan. In a large bowl, mash the banana, then whisk in the yogurt, egg, oil, and vanilla.
2. Whisk flour, baking powder, and baking soda together in a separate bowl. Stir the dry mix into the wet ingredients until just combined.
3. Gently fold in the chopped strawberries.
4. Transfer batter to the pan, smooth the top, and bake 20 to 22 minutes until golden and a toothpick comes out clean. Cool in the pan for 10 minutes before turning out.
5. Cool completely on a rack, then slice and serve.

Notes

If your strawberries are especially juicy, toss them in a teaspoon of the flour before folding them in so they don’t bleed too much color into the batter. For a celebratory touch, spread on a thin cream cheese frosting once the cake is fully cool.