Anna Olson's Banana Cake Recipe: Velvet Crumb with Spiced Rum Infusion

This Anna Olson banana cake recipe delivers a velvet crumb and subtle spiced rum infusion that transforms simple ingredients into something extraordinary. 💛 The secret lies in perfectly ripened bananas and a precise creaming method that creates a tender, moist texture—no dry crumbs here. I developed this version after years of testing, ensuring every slice stays soft and flavorful for days.

The recipe begins with ripe bananas mashed into a smooth puree, which forms the cake’s natural sweetness and moisture base. A touch of spiced rum adds depth without overpowering, while the classic creaming method (butter and sugar beaten until light) ensures a fine, airy crumb. Baking at 350°F for 30-40 minutes guarantees a golden top and perfect doneness every time.

What sets this apart is the spiced rum infusion, which caramelizes slightly during baking, creating layers of warm vanilla and cinnamon notes. The result? A cake with a tender crumb, rich banana flavor, and just enough warmth to make it feel like a hug in dessert form. It’s the kind of recipe that earns second helpings—and compliments.

Whether you’re baking for a crowd or treating yourself, this banana cake delivers restaurant-quality results with minimal effort. The frosting (optional but recommended) adds an extra touch of elegance, making it perfect for celebrations or cozy weeknight indulgences. Let’s get baking!

Ingredients for anna olson banana cake

Perfectly ripe bananas and a touch of spiced rum create this velvety banana cake's signature flavor.

The bananas are non-negotiable—ripe with brown speckles is key for that perfect balance of sweetness and moisture. Whole Foods or your local market usually have the best selection, but check your fruit bowl first. The spiced rum adds depth without overpowering, so Captain Morgan or Bacardi work perfectly. For the butter, I always grab Land O’Lakes unsalted—it’s reliable and melts beautifully. The flour? King Arthur all-purpose is my go-to for consistent results, but Bob’s Red Mill works too. Sift it before measuring to avoid dense crumbs.

No spiced rum? Vanilla extract plus a pinch of cinnamon mimics the warmth, though it won’t caramelize like the rum. Short on bananas? Substitute with 1 cup mashed apples or pears, but the flavor will shift slightly. The sour cream adds moisture, but Greek yogurt works in a pinch. For the frosting, if you’re avoiding dairy, coconut cream whipped with powdered sugar is a great swap. The nutmeg is crucial—freshly grated makes all the difference, but pre-ground is fine if you’re in a hurry. Just don’t skip it entirely.

This cake keeps beautifully—3-4 days at room temperature wrapped in foil, or up to 5 days in the fridge. The frosting, if made, should be added the day you serve it for the best texture. For make-ahead baking, prepare the cake batter and refrigerate overnight—it actually develops deeper flavor. Portion into slices and freeze for up to 3 months if you’re prepping for a crowd. Just thaw at room temperature before serving.

Step-by-step instructions for Anna Olson's banana cake recipe

Here's the method for Anna Olson's signature banana cake—moist, tender crumb with warm spiced rum notes.

In a stand mixer fitted with the paddle attachment, combine the 1 cup softened unsalted butter and 2 cups granulated sugar. Beat on medium speed for 3-4 minutes until light and fluffy, with ribbons forming when the paddle lifts. This step is crucial—it incorporates air for that signature tender crumb.

Reduce speed to low and add the 0.25 cup spiced rum and 1 teaspoon vanilla extract. Mix for 30 seconds until fully incorporated. The rum adds depth while keeping the cake moist—don't skip this infusion. Scrape down the sides of the bowl to ensure even mixing before proceeding.

Add the 2 whole room-temperature eggs, one at a time, mixing on low speed for 30 seconds after each addition. This gradual incorporation prevents curdling. Then add the 0.5 cup sour cream and mix for another 30 seconds until smooth.

The sour cream contributes richness and moisture that keeps this cake tender for days. Here's the thing—if you use cold eggs, they'll create pockets of uncooked egg in your cake. That's why room temperature matters. Mix just until combined; overmixing develops gluten and makes the cake dense.

In a separate bowl, whisk together the 2 cups all-purpose flour, 0.5 teaspoon baking soda, 1 teaspoon ground cinnamon, 0.25 teaspoon ground nutmeg, and 0.5 teaspoon salt. Sift the dry ingredients directly into the wet mixture on low speed to avoid a cloud of flour.

In a small bowl, mash the 3 medium ripe bananas to a smooth puree—no lumps should remain. Add the banana puree to the mixer and blend on low speed for 1 minute until just combined. The batter will be thick but pourable. Don't overmix; you're looking for a smooth, velvety consistency with no flour streaks.

Preheat your oven to 350°F. Grease two 9-inch round cake pans and line the bottoms with parchment paper. Divide the batter evenly between the pans and smooth the tops. Bake for 30-35 minutes until a toothpick inserted in the center comes out clean and the edges are golden brown.

I always tap the pans gently on the counter when they come out—they should spring back slightly. This confirms proper doneness. Let the cakes cool in the pans for 10 minutes, then transfer to a wire rack to cool completely. The wait is worth it; cooling prevents the frosting from melting and ensures clean slices.

For the frosting, combine the 2 cups powdered sugar, 0.5 cup chilled heavy cream, and 1 teaspoon vanilla extract in a bowl. Whip with an electric mixer on high speed for 2-3 minutes until smooth and fluffy. The frosting should be thick enough to hold peaks but still spreadable.

Spread the frosting between the cooled cake layers and over the top and sides. The spiced rum notes in the cake pair beautifully with the creamy frosting. For extra flair, dust the top with a pinch of ground cinnamon or a sprinkle of toasted coconut flakes. Serve at room temperature for the best texture and flavor experience.

Troubleshooting this recipe

Dense Cake Texture

If your cake turns out dense instead of tender, overmixing is usually the culprit. I’ve found that mixing the batter on low speed for just 1 minute after adding the banana puree prevents developing too much gluten. Also, ensure your bananas are ripe with brown speckles—underripe bananas lack natural sugars that help create lift. 🍌

Cake Sinks in Center

A sunken center often means the cake didn’t bake long enough or the oven wasn’t hot enough. Double-check your oven temperature with an oven thermometer—many home ovens run 25°F hotter or cooler than set. Bake until a toothpick comes out clean, even if it means adding 5-10 extra minutes. Also, avoid opening the oven door during the first 20 minutes of baking to prevent temperature drops.

Dry or Crumbly Cake

Dryness usually stems from overbaking or using too much flour. Stick to the 30-35 minute bake time and check for doneness with a toothpick. If your cake still feels dry, the issue might be in the mixing—ensure you’re not over-creaming the butter and sugar. Adding an extra 1 tablespoon of sour cream to the batter can also restore moisture without altering texture.

Rum Flavor Too Strong

The spiced rum adds depth, but if it overpowers the banana flavor, you can reduce it to 0.125 cup or replace it with 1 teaspoon vanilla extract plus 0.25 teaspoon cinnamon. For a more balanced flavor, let the cake cool completely before frosting—this allows the rum’s warmth to mellow slightly. If you’re sensitive to alcohol, bake the cake uncovered for the first 10 minutes to let some of the rum evaporate.

Cracked Top

Cracks often appear when the cake bakes too quickly or the oven is too hot. To prevent this, place your cake pans on the middle rack of the oven and avoid opening the door during baking. If cracks do appear, they’re purely cosmetic—the cake will still taste delicious. For extra insurance, tap the pans gently on the counter before baking to release any air bubbles.

Frosting Too Thin

If your rum cream frosting turns out too thin, it’s likely because the heavy cream wasn’t cold enough. Chill the 0.5 cup heavy cream for at least 30 minutes before whipping. For a thicker frosting, add 1 tablespoon powdered sugar at a time while mixing. If it’s still too runny, place the bowl in the freezer for 5 minutes to firm up slightly before spreading.

Frequently asked questions