Banana Bundt Cake Recipe With Sour Cream: Ultra-Moist Spice Swirls and Buttery Crust

This banana bundt cake recipe with sour cream delivers ultra-moist layers and a buttery crust that will have everyone asking for seconds. The secret lies in the sour cream—it creates a tender crumb while keeping the cake rich and flavorful. I developed this version after years of testing, and it never fails to impress, whether for a family gathering or a special dessert night.

The spice swirl adds warmth and depth, balancing the natural sweetness of ripe bananas. You'll start with a simple batter, then fold in a cinnamon-sugar mixture for those signature swirls that make this cake visually stunning. Baking at 350°F for 50-60 minutes ensures a perfectly golden crust while keeping the inside moist and inviting.

What sets this recipe apart is the foolproof technique for achieving that signature Bundt cake texture—no dry or gummy edges here. The sour cream not only enhances moisture but also adds a subtle tang that complements the caramelized banana flavor. Once baked, a light dusting of powdered sugar or a drizzle of caramel takes it to the next level.

Serve warm with vanilla ice cream or whipped cream for the ultimate indulgence. This cake is perfect for holidays, birthdays, or whenever you crave a dessert that tastes homemade. Let's get baking—your kitchen will smell amazing in no time.

Ingredients for banana bundt cake recipe with sour cream

These simple, quality ingredients create the perfect ultra-moist banana bundt cake with buttery crust.

The bananas are everything here—ripe, speckled ones with that soft give when squeezed. Trader Joe's or your local grocery store's produce section usually has the best selection. I always grab a few extra because they get used up fast in smoothies too. The sour cream is non-negotiable for that tender crumb—full-fat works best, but low-fat in a pinch. For the butter, Land O'Lakes or Plugrá are my go-tos, but any good-quality unsalted will do. If you're using a Bundt pan, make sure it's well-greased—flour plus butter works great for easy release.

No sour cream? Greek yogurt or mashed avocado adds moisture too, though the texture won't be quite the same. Running short on cinnamon? Cinnamon sticks ground in a spice grinder taste better than store-bought. The vanilla extract should be pure—no imitation stuff. For the cinnamon-sugar swirl, mix the extra sugar and cinnamon in a small bowl before folding it in. Pro tip: if your bananas aren't ripe enough, pop them in a paper bag with an apple overnight. They'll be perfect by morning.

This cake keeps well for 3-4 days in an airtight container at room temperature, though it's best enjoyed fresh. For longer storage, wrap tightly and refrigerate for up to 1 week. The flavor actually improves overnight as the spices meld. To reheat, wrap a slice in a damp paper towel and microwave for 10-15 seconds. I always bake two pans—one for the freezer. Wrap individual slices in plastic wrap and freeze for up to 3 months. Perfect for last-minute desserts!

Step-by-step instructions for banana Bundt cake with sour cream

Let's bake a cake so moist it'll disappear faster than you can say "second slice."

Mash the 2 cups ripe bananas in a medium bowl until completely smooth—no lumps allowed. The riper the bananas, the sweeter and more flavorful your cake will be. In a separate large bowl, whisk together the 1 cup sour cream, 1 cup melted unsalted butter (cooled to room temperature), 1.5 cups granulated sugar, 2 whole large eggs, 1 tbsp vanilla extract, and the mashed bananas until fully combined. This mixture is the secret to that ultra-moist texture we're after.

Here's the thing—don't skip letting the melted butter cool. If it's too hot when you mix it with the eggs, you'll end up with scrambled eggs instead of a smooth batter. Stir in the 2.5 cups all-purpose flour, 2 tsp baking powder, 2 tsp ground cinnamon, 0.5 tsp ground nutmeg, and 0.5 tsp salt. Mix just until combined—overmixing develops gluten and makes the cake dense. You should still see some flour streaks.

In a small bowl, combine 0.25 cup granulated sugar and 2 tbsp ground cinnamon to make your cinnamon-sugar swirl. This is where the magic happens—those warm, spicy notes cut through the sweetness and make every bite exciting. Spread about half of the banana batter into a greased 10-12 cup Bundt pan, then sprinkle half of the cinnamon-sugar mixture on top.

I like to use a spoon to make little swirls in the batter before adding the cinnamon sugar—it creates beautiful patterns when you pour the rest of the batter over it. Pour the remaining batter over the cinnamon-sugar layer, then sprinkle the rest of the cinnamon-sugar mixture on top. Gently tap the pan on the counter a few times to help the cinnamon sugar settle into the batter.

Preheat your oven to 350°F and let it come to temperature before baking. Place the Bundt pan in the center rack and bake for 50-60 minutes, or until a toothpick inserted in the center comes out clean with just a few moist crumbs clinging to it. The cake should look golden brown on top and feel springy to the touch when you press the center lightly.

If you're unsure whether it's done, here's what to watch for: the edges should pull away from the pan slightly, and the cake should have a beautiful rise with a slightly domed top. The first 30 minutes are critical—don't open the oven door during this time. After 30 minutes, you can check for doneness, but resist the urge to peek too often.

Remove the cake from the oven and let it cool in the pan for 15 minutes. Then, carefully invert it onto a wire rack to cool completely. Here's a pro tip: run a thin knife around the edges of the cake before inverting to help loosen it from the pan. Once fully cooled, dust the top generously with 0.5 cup powdered sugar using a fine-mesh sieve for that bakery-fresh look.

This cake tastes best at room temperature, so if you're in a hurry, you can serve it after just 30 minutes of cooling—but trust me, waiting the full hour makes all the difference. The texture will be perfect: tender, moist, and full of those warm cinnamon-sugar swirls throughout. Serve with a dollop of whipped cream or a scoop of vanilla ice cream for the ultimate dessert experience.

Best sauces and condiments for this recipe

Classic Vanilla Glaze

This simple 2-tablespoon butter and ½ cup powdered sugar glaze is my go-to for banana bundt cake. Warm the cake slightly before drizzling—it soaks in beautifully while adding a glossy finish. For extra flavor, add 1 teaspoon vanilla extract and 1 tablespoon milk to thin it out. 🥄

Caramel Drizzle

Elevate your cake with a rich caramel drizzle made from ½ cup granulated sugar and 3 tablespoons heavy cream. Cook the sugar in a saucepan until amber, then carefully whisk in the cream. Let it cool slightly before drizzling over the cake. This adds a buttery, toasty contrast that pairs perfectly with the banana's natural sweetness.

Lemon Cream Cheese Frosting

For a tangy twist, blend 4 ounces cream cheese, ½ cup butter, 2 cups powdered sugar, 1 tablespoon lemon juice, and 1 teaspoon vanilla extract until smooth. The citrus brightens the warm spices in the cake, creating a refreshing balance. Spread a thin layer on the cooled cake or use it as a filling for a layered dessert.

Spiced Whipped Cream

Whip 1 cup heavy cream with 2 tablespoons powdered sugar, ½ teaspoon cinnamon, and ¼ teaspoon nutmeg until soft peaks form. This adds a light, airy texture that complements the cake's density. Garnish with a sprinkle of cinnamon for extra flair.

Chocolate Ganache

Melt ½ cup dark chocolate chips with ¼ cup heavy cream over a double boiler, then let it cool slightly before pouring over the cake. The deep chocolate flavor contrasts beautifully with the banana's sweetness. For a smoother finish, strain the ganache before drizzling. 🍫

Maple Walnut Topping

Toast ½ cup chopped walnuts in a dry pan until fragrant, then toss with 2 tablespoons melted butter and 1 tablespoon maple syrup. Sprinkle over the cake while warm for a crunchy, nutty contrast. This topping adds texture and a subtle earthy sweetness that enhances every bite.

Frequently asked questions