I can’t get over how brown butter, ripe bananas, and salted caramel buttercream make this gluten free snack cake feel totally bakery-worthy. One slice and you’ll see why it disappears fast.

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I’m obsessed with this Banana Snack Cake because it tastes like banana bread got tired of being humble and put on a thick layer of salted caramel buttercream. The cake is soft, fluffy, and packed with mashed very ripe bananas, with brown butter sneaking in that rich, nutty flavor I cannot stop thinking about.

And the frosting? Sweet, salty, buttery, unapologetic.

I love that it’s gluten free but still has the kind of tender crumb that makes everyone go back for another square. But honestly, I’m here for that banana caramel combo.

Ridiculous in the best possible way every time.

Ingredients

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Browned butter makes the cake nutty and cozy, like banana bread’s cooler cousin.
Brown sugar brings deep sweetness and keeps every bite soft, not dry.
Ripe bananas do the heavy lifting with natural sweetness and big banana flavor.
Greek yogurt or sour cream adds tang and makes the crumb super tender.
Eggs hold it all together, so the cake slices cleanly.
Gluten free flour keeps it friendly without making it taste “special diet.
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Cinnamon adds warmth, but doesn’t boss the bananas around.
Milk loosens the batter so the cake bakes up soft.
Buttercream butter makes the frosting rich, creamy, and honestly hard to resist.
Powdered sugar gives the frosting that fluffy, sweet bakery-style feel.
Caramel sauce brings sticky, buttery sweetness that totally belongs here.
Heavy cream or milk helps the frosting spread without tearing the cake.
Vanilla rounds everything out, like a little background hug.
Basically, flaky sea salt keeps the frosting from being too sweet.
Plus, extra salt on top makes each bite pop in the best way.

Ingredient Quantities

For the cake: 1/2 cup unsalted butter, browned

For the cake: 3/4 cup packed light brown sugar

For the cake: 1/4 cup granulated sugar

For the cake: 2 large eggs, room temperature

For the cake: 1 1/2 cups mashed very ripe bananas (about 3 medium)

For the cake: 1/2 cup plain Greek yogurt or sour cream

For the cake: 1 teaspoon vanilla extract

For the cake: 2 cups gluten free all purpose flour blend, preferably one that contains xanthan gum

For the cake: 1 teaspoon baking powder

For the cake: 1/2 teaspoon baking soda

For the cake: 1/2 teaspoon fine salt

For the cake: 1 teaspoon ground cinnamon

For the cake: 1/4 cup milk (dairy or non dairy)

For the salted caramel buttercream: 1/2 cup unsalted butter, softened

For the salted caramel buttercream: 3 to 3 1/2 cups powdered sugar, sifted

For the salted caramel buttercream: 3/4 cup homemade or store bought caramel sauce, cooled

For the salted caramel buttercream: 2 to 3 tablespoons heavy cream or milk, as needed for consistency

For the salted caramel buttercream: 1 teaspoon vanilla extract

For the salted caramel buttercream: 1/2 teaspoon flaky sea salt or to taste

Optional garnish: flaky sea salt for sprinkling

How to Make this

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1. Preheat oven to 350°F (175°C). Grease and line an 8×8 inch or 9 inch round baking pan with parchment paper, leaving an overhang for easy removal.

2. Brown 1/2 cup unsalted butter in a light colored skillet over medium heat, swirling until it smells nutty and has golden brown bits. Transfer to a bowl and let cool slightly.

3. In the bowl with the cooled browned butter, whisk together 3/4 cup packed light brown sugar and 1/4 cup granulated sugar until combined. Add 2 large room temperature eggs one at a time, whisking until smooth.

4. Stir in 1 1/2 cups mashed very ripe bananas, 1/2 cup plain Greek yogurt or sour cream, and 1 teaspoon vanilla extract until evenly combined.

5. In a separate bowl, whisk together 2 cups gluten free all purpose flour blend, 1 teaspoon baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon fine salt, and 1 teaspoon ground cinnamon.

6. Add the dry ingredients to the wet mixture in two additions, alternating with 1/4 cup milk, beginning and ending with the dry ingredients. Mix until just combined and the batter is smooth but not overmixed.

7. Pour the batter into the prepared pan, smooth the top, and bake for 30 to 35 minutes or until a toothpick inserted in the center comes out clean or with a few moist crumbs. Cool in the pan for 10 minutes, then lift out using the parchment overhang and cool completely on a wire rack.

8. For the salted caramel buttercream, beat 1/2 cup softened unsalted butter until creamy. Gradually add 3 to 3 1/2 cups sifted powdered sugar on low speed until incorporated.

9. Add 3/4 cup cooled caramel sauce, 1 teaspoon vanilla extract, and 2 to 3 tablespoons heavy cream or milk as needed to reach a spreadable consistency. Beat on medium speed until light and fluffy, then fold in 1/2 teaspoon flaky sea salt to taste.

10. Frost the cooled cake with the salted caramel buttercream, drizzle additional caramel if desired, and sprinkle optional flaky sea salt on top before serving.

Equipment Needed

1. 8×8 inch square or 9 inch round baking pan lined with parchment paper
2. Light colored skillet for browning butter
3. Mixing bowls (one large for wet, one for dry)
4. Whisk and silicone spatula
5. Measuring cups and spoons
6. Electric hand mixer or stand mixer for buttercream
7. Wire cooling rack
8. Toothpick or cake tester

FAQ

Q: Can I make this cake gluten free successfully? A: Yes. Use a 1:1 gluten free all purpose flour blend that contains xanthan gum for structure; if your blend lacks xanthan gum add 1/4 teaspoon per cup of flour.

Q: Do I have to brown the butter for the cake? A: No, but browning the butter adds a deep, nutty flavor that elevates the cake. If short on time you can use melted unsalted butter cooled to warm temperature.

Q: How do I prevent the frosting from being too thin or too sweet? A: Start with 3 cups powdered sugar and 3 4 cup caramel, then add heavy cream 1 teaspoon at a time until spreadable. If too thin, add more sifted powdered sugar in small increments; if too sweet, a pinch more flaky sea salt balances it.

Q: Can I use store bought caramel sauce in the buttercream? A: Yes. Use a good quality caramel and make sure it is cooled so it does not melt the butter. Homemade or thicker caramel gives the best texture and flavor.

Q: How should I store the cake and how long will it keep? A: Store frosted cake covered in the refrigerator for up to 4 days. Bring to room temperature for 30 to 60 minutes before serving for best texture. Unfrosted layers can be wrapped and frozen up to 2 months.

Q: Can I add nuts or chocolate chips to the batter? A: Yes. Fold in up to 3 4 cup chopped toasted nuts or 1 cup chocolate chips after the batter is mixed. Toasting nuts enhances flavor and helps keep them crunchy.

Banana Snack Cake With Salted Caramel Buttercream Recipe Substitutions and Variations

For the cake: 1/2 cup unsalted butter, browned — Substitute: 1/2 cup melted unsalted butter (no browning) for similar fat and texture; or 1/2 cup ghee or clarified butter for a nutty, stable fat; or 1/2 cup neutral oil (canola or light olive) if you need dairy free.
For the cake: 1/2 cup plain Greek yogurt or sour cream — Substitute: 1/2 cup buttermilk or thinned plain yogurt (yogurt + 1 tbsp milk) for equivalent tang and moisture; or 1/2 cup applesauce or mashed banana to reduce fat and add moisture (may slightly change crumb).
For the cake: 2 cups gluten free all purpose flour blend, preferably one that contains xanthan gum — Substitute: 2 cups regular all purpose flour for non gluten free version; or use a 1:1 GF blend without xanthan plus 1/2 teaspoon xanthan gum for structure; or use a mix of 1 1/3 cups almond flour + 2/3 cup tapioca starch for a lighter, nutty GF option (texture will differ).
For the salted caramel buttercream: 3/4 cup homemade or store bought caramel sauce — Substitute: 3/4 cup dulce de leche or thickened sweetened condensed milk caramel for similar flavor; or 3/4 cup brown sugar caramel made by cooking brown sugar with butter and a splash of cream for an easy substitution.

Pro Tips

– Brown the butter slowly and watch it closely. Use a light colored skillet so you can see the milk solids turn golden, and take it off the heat just as it smells nutty. Let it cool until warm, not hot, before adding eggs so you do not scramble them.

– Use very ripe bananas for maximum sweetness and moisture. If yours are not ripe enough, roast them in their skins at 350°F for 15 to 20 minutes until blackened, then mash — the flavor deepens and the cake will be more banana-forward.

– Be gentle with the gluten free flour blend. Mix only until the batter is homogenous to avoid a gummy crumb. If your blend does not contain xanthan gum, add 1/2 teaspoon per cup of flour to help with structure. If the batter seems too thick, a tablespoon or two more milk will make it easier to spread.

– For the caramel buttercream, add caramel and cream slowly and taste as you go. If the frosting feels too loose after adding caramel, chill it for 10 to 15 minutes and re-whip to firm it up. Finish with flaky sea salt just before serving so the texture stays crisp.