Butter Rum Loaf is a moist, buttery loaf cake that gets soaked with a warm rum butter syrup until it’s glossy and a little sticky on the outside. It’s rich in that classic way that reminds me of old-school rum cake, but in an easy loaf form that slices neatly.
The flavor is all about vanilla, butter, and dark rum, and the crumb stays tender for days because of the soak. I like this version because the syrup actually soaks in (instead of just sitting on top), so you get that rum-butter taste in every slice.
I make this most often for weekends and holidays, especially when I want a dessert that doesn’t need frosting. It’s also really nice with a simple dusting of powdered sugar and a cup of coffee after dinner.
Why You’ll Love This Recipe
That rum-butter soak: The warm syrup is what makes the loaf special. It gives the cake a deeper flavor and a soft, almost custardy feel near the edges.
Simple loaf cake vibe: No layers, no frosting, no fuss. You just slice it and it looks great on a plate.
Great for holidays: It fits right in with holiday desserts, but it’s easy enough to bake on a random weekend when you want something a little richer.
Dark rum flavor: Using dark rum makes the whole thing taste more rounded and warm. If you’ve had rum cake before, this hits the same notes.
Pecan option: Chopped pecans add a little crunch and make it feel more like a classic southern-style loaf. I like them, but it’s still excellent without.
Ingredients You’ll Need
Loaf Batter
- All-purpose flour: I use regular flour here. Spoon and level if you tend to pack flour into the measuring cup.
- Baking powder: This is what gives the loaf a nice lift without making it airy like cake mix cake.
- Fine salt: Don’t skip it. It keeps the loaf from tasting flat once the syrup goes on.
- Unsalted butter: Softened butter creams better, so you get a tighter, tender crumb instead of a dense one.
- Granulated sugar: Keeps the flavor clean and classic. I stick with white sugar in both the cake and the syrup for this one.
- Eggs: Room temp is easier to mix in smoothly. Cold eggs can make the batter look a little curdled.
- Vanilla extract: Vanilla and rum are a really good pair here. Use the good stuff if you have it.
- Dark rum: Dark rum gives a deeper, almost caramel note. Light rum works in a pinch, but the flavor won’t be as bold.
- Whole milk: Whole milk makes the crumb softer and richer. Lower fat milk works, but the loaf won’t feel quite as buttery.
- Nonstick spray or butter: Grease the pan well, especially the corners. This loaf likes to cling.
- Pecans (optional): If you want a little crunch, add them. I chop them fairly small so they don’t sink as much.
Rum Butter Syrup
- Unsalted butter: This is the base of the syrup, so butter flavor matters. I use the same butter I bake with.
- Granulated sugar: Dissolves quickly and keeps the syrup smooth. It also helps the loaf stay moist.
- Water: Just enough to help the sugar melt without scorching before everything loosens up.
- Dark rum: Stir it in off the heat so the flavor stays strong. It smells sharp at first, then mellows as it soaks in.
- Vanilla extract: Makes the syrup taste more like dessert and less like straight rum.
- Salt: A tiny pinch makes the syrup taste more buttery and rounded.
Optional
- Powdered sugar: Nice if you want a simple finish. I do it right before serving so it doesn’t melt away.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F. Grease a 9×5-inch loaf pan with nonstick spray or butter, and line with parchment if you want easier removal.
- Mix the dry ingredients: Whisk the flour, baking powder, and salt together in a medium bowl, then set aside.
- Cream the butter and sugar: In a large bowl, beat the softened butter and sugar until light and fluffy.
- Add the eggs: Beat in the eggs one at a time, mixing well after each one. Stir in the vanilla.
- Add the flour and milk: Mix in the dry ingredients alternating with the milk, just until you don’t see dry flour. Don’t overmix.
- Add the rum: Stir in the rum, and fold in the chopped pecans if you’re using them.
- Bake: Pour the batter into the pan and bake for 50 to 60 minutes, until a tester comes out clean. If the loaf browns too fast, tent with foil for the last 10 to 15 minutes.
- Cool briefly: Let the loaf cool in the pan for about 10 minutes, then turn it out onto a rack set over a tray.
- Make the syrup: While the loaf bakes, melt the butter with sugar and water over medium heat. Stir until the sugar dissolves and the mixture is smooth, about 2 to 3 minutes.
- Finish the syrup: Remove from heat, then stir in the rum, vanilla, and a pinch of salt.
- Soak the loaf: Poke the warm loaf all over with a skewer. Slowly brush or spoon the syrup over the top and sides, letting it absorb, and repeat until all the syrup is used.
- Cool completely: Let the loaf cool fully before slicing so it sets up and cuts cleanly.
Some of my tips!
This is the part that really makes a difference. If you only read one section, make it this one because this is where I share the little trick that helps the recipe turn out so well.
Recipe Tips & Tricks
Don’t overmix once the flour goes in. Mix just until the batter comes together. Overmixing makes the loaf tighter and a little tough.
Use dark rum if you can. The flavor comes through more clearly, especially once it’s mixed with butter and vanilla. Light rum works, but it tastes a bit thinner.
Tent with foil if the top gets too brown. Some ovens brown loaf cakes quickly. A loose piece of foil for the last part of baking keeps the top from getting dry.
Soak it while it’s warm. A warm loaf takes in syrup better than a cooled loaf. Go slowly so it has time to absorb instead of running off.
For less alcohol, use rum extract. Use rum extract in the batter, and replace the rum in the syrup with water or apple juice. You still get that butter-rum feel without as much bite.
Make some touches!
There are plenty of easy ways to serve this depending on the occasion. Keep it simple, or add a few small touches to make it feel a little more special.
Serving Suggestions
- Powdered sugar: A light dusting right before serving is all it needs. It’s a simple finish that looks nice on a platter.
- Whipped cream: A spoon of softly whipped cream is good if you want to make it feel a little more like a plated dessert. I usually keep it unsweetened or lightly sweetened.
- Fruit: Fresh berries or sliced peaches are nice on the side. The loaf is rich, so fruit makes the plate feel less heavy.
- Coffee or espresso: This is really good with coffee, especially if you serve it after dinner. A strong cup works best.
- Ice cream: Vanilla ice cream on the side is great if you’re serving this for dessert. Let the loaf sit at room temp so it slices neatly, then add ice cream.
Save it for later
This section covers how to store leftovers and what parts of the recipe you can prepare ahead of time.
Storage and Make Ahead
Store the loaf tightly covered at room temperature for 2 to 3 days. I usually keep it under a cake dome or wrapped well so the edges don’t dry out.
For a longer hold, store it covered in the fridge for up to 5 days. Let slices sit out for 15 to 20 minutes before serving so the butter flavor comes through more.
You can freeze individual slices or freeze the whole loaf (well wrapped) for up to 2 months. Thaw in the fridge overnight, or thaw slices on the counter for a couple of hours.
If you like it a little warm, microwave a slice for 10 to 15 seconds. It softens the crumb and brings the rum and vanilla back forward.
A few quick answers
This section covers a few extra details that may help before you head to the recipe card.
Recipe FAQs
Can I make this without alcohol?
Yes. Use rum extract in the batter, then replace the rum in the syrup with water or apple juice. You’ll still get a butter-vanilla loaf with a “rum cake” style flavor.
How do I know when the loaf is done?
A tester should come out clean, and the top should feel set when you press it lightly. In most ovens it’s around 50 to 60 minutes, but loaf cakes can vary, so I start checking at 50.
Why did my loaf turn out dry?
The two most common reasons are overbaking and overmixing. Pull it as soon as the tester is clean, and mix the flour in just until combined.
Can I add nuts or leave them out?
You can do either. Pecans are great here, but I keep the pieces fairly small so they don’t sink and so the slices cut cleanly. If you’re not a nut person, skip them and the loaf still has plenty of flavor.
Does the syrup make the loaf soggy?
Not if you add it slowly and let it soak in between passes. The outside gets glossy and a little sticky, but the inside stays tender rather than wet.
You might also like
Before you go, take a look at a few other recipes below the recipe card. They use similar ingredients in a different way and are worth saving too.
MORE DINNER RECIPES TO TRY
Butter Rum Loaf
INGREDIENTS
Loaf Batter
- 1 3/4 cups all purpose flour
- 2 tsp baking powder
- 1/2 tsp fine salt
- 1/2 cup unsalted butter softened
- 1 cup granulated sugar
- 2 large eggs room temperature
- 1 tsp vanilla extract
- 1/4 cup dark rum
- 1/2 cup whole milk
- nonstick spray or butter for pan.
Rum Butter Syrup
- 1/2 cup unsalted butter
- 1/2 cup granulated sugar
- 3 tbsp water
- 1/4 cup dark rum
- 1/2 tsp vanilla extract
- pinch salt.
Optional
- 1/2 cup chopped pecans
- powdered sugar for serving.
INSTRUCTIONS
Prepare and bake
- Heat oven to 350 F
- grease a 9x5 inch loaf pan and line with parchment if desired
- whisk flour baking powder and salt
- cream butter and sugar until light
- beat in eggs one at a time then vanilla
- mix in dry ingredients alternating with milk just until combined then stir in rum and optional pecans
- pour into pan and bake until a tester comes out clean 50 to 60 minutes
- cool in pan 10 minutes then turn out onto a rack set over a tray.
Make syrup and soak
- While loaf bakes melt butter with sugar and water over medium heat stirring until sugar dissolves and mixture is smooth 2 to 3 minutes
- remove from heat and stir in rum vanilla and salt
- poke warm loaf all over with a skewer
- slowly brush or spoon syrup over top and sides letting it absorb and repeat until used
- cool completely before slicing.
