Banana Crumb Cake - Celebrating Sweets

This delicious Banana Crumb Cake combines two classics: banana bread and crumb cake! Moist banana cake topped with a buttery brown sugar crumble and vanilla icing.

We’re adding a crumbly topping to our banana bread because it’s a fact that everything is better with a crumbly topping. And while we’re at it, we’re also adding a generous drizzle of vanilla icing. Yum!

Two of my most popular recipes are Banana Bread and Banana Nut Muffins, so I know you love baking with bananas. This cake is perfect for breakfast, dessert, or snacking. Does a big square slice alongside a glass of iced coffee make for the BEST EVER afternoon snack? It sure does!

What makes this recipe the best?

  • Banana cake – The base of this recipe is a sweet, soft, moist banana cake that is baked in a 9-inch square pan.
  • Crumb topping – A buttery, brown sugar crumble adorns the top of the cake. This is a simple mixture of flour, brown sugar, salt, and melted butter. Feel free to add cinnamon if you’d like.
  • Vanilla icing – The perfect finishing touch! A drizzle of sweet vanilla icing made from powdered sugar, milk, and a splash of vanilla extract.

Recipe tips and storage

  • Make sure to use overripe bananas. They’ll be extra sweet and they’ll mash-up really easily. This recipes uses 1 cup of mashed bananas, which is about 2 large or 3 medium-sized bananas.
  • Use a 9×9 baking pan for even baking. This is my preferred pan size for this recipe, as well as my banana bread recipe. Why? I find that the cake bakes evenly without the risk of the edges getting dried out before the center is baked through. If you choose to make this recipe in an 8×8 pan, you’ll need to adjust the bake time by adding approximately 8-10 minutes. If the top starts to get dark you can loosely tent it with foil.
  • This cake can be stored tightly covered at room temp for up to 2 days. Leftovers can also be frozen.
  • If you’re out of sour cream you can try one of these Sour Cream Substitutes.

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Marcus Vance

Marcus Vance

Cybersecurity & Digital Privacy Researcher

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.