This easy rum cake recipe from scratch delivers a rich, buttery Caribbean holiday dessert. Made with dark rum, butter, and cream for an incredibly moist bundt cake perfect for celebrations.
Preheat oven to 350°F. Thoroughly grease your bundt pan with shortening, getting into every groove and crevice. Dust with flour and tap out excess, this step prevents sticking.
In a medium bowl, whisk together 3 cups flour, 1 teaspoon baking soda, 2 teaspoons baking powder, and ⅛ teaspoon salt. Set aside.
Using a stand mixer with paddle attachment or hand mixer, beat 1 ½ cups butter and 1 ½ cups sugar on medium-high speed for 3-4 minutes until light, fluffy, and pale yellow in color. Stop and scrape down the bowl halfway through. This incorporates air for a tender crumb, don't rush this step.
Reduce speed to medium-low. Add 1 teaspoon vanilla extract, 3 eggs, and 1 egg yolk one at a time, mixing well after each addition. The mixture should look smooth and creamy.
Slowly pour in 1 cup rum, 1 tablespoon lemon zest, and 1 cup heavy cream, mixing just until incorporated. Reduce mixer to low speed and gradually add the flour mixture. Mix only until no streaks remain, overmixing creates a tough cake.
Pour batter evenly into prepared bundt pan. Smooth the top with a spoon and tap pan firmly on counter 2-3 times to release air bubbles.
Bake 50-60 minutes until a toothpick inserted in the center comes out clean or with just a few moist crumbs. The top should spring back when lightly pressed.
Let cake cool in pan on a wire rack for 10-15 minutes, no longer or it may stick. Carefully invert onto a rack and cool completely before slicing. Dust with powdered sugar just before serving for a beautiful presentation.