Brown Sugar Rum Coffee Cake is a moist, buttery coffee cake with a thick cinnamon streusel and a simple rum glaze on top. It’s the kind of cake I bake when I want something a little richer than a plain sour cream coffee cake, but still familiar.
The flavor is all about brown sugar, warm cinnamon, and that little hint of dark rum that makes it taste more grown-up. The crumb stays soft for days thanks to the sour cream, and the streusel bakes up clumpy and crisp in the best way.
I like this one for brunch, holiday mornings, or when friends are coming over and I want a cake that slices neatly and looks good on a plate. It’s also great with strong coffee, especially if you add the espresso powder.
Why You’ll Love This Recipe
Soft, moist crumb: Sour cream and butter keep this cake tender and rich, so it doesn’t dry out the next day.
Real streusel topping: The cinnamon-brown sugar streusel bakes into craggy little clusters that give you that classic coffee cake bite.
Rum flavor (not harsh): Dark rum adds warmth and depth, especially once it’s mixed into the glaze.
Bundt or sheet cake: I like it in a bundt for parties, but a 9×13 pan is easier for casual weekends.
Easy to tweak: Pecans, walnuts, mini chocolate chips, coffee liqueur, or Greek yogurt all work well here.
Ingredients You’ll Need
Streusel
- Light brown sugar: This is the main flavor in the streusel. Pack it in the cup so you don’t end up with a dry, sandy topping.
- All-purpose flour: I use regular flour here to give the streusel structure so it stays clumpy instead of melting into the cake.
- Ground cinnamon: Don’t skimp here. It’s what makes the whole cake smell and taste like a proper coffee cake.
- Kosher salt: A little salt keeps the streusel from tasting flat and too sweet.
- Unsalted butter: Melted butter is what makes the streusel come together fast. Let it cool for a minute or two so it doesn’t feel scorching hot when you stir it in.
- Pecans (optional): I like the crunch, but you can leave them out or swap chopped walnuts. Toasting them first is nice if you have the time.
Cake Batter
- All-purpose flour: Just regular flour works best. Spoon and level if you tend to overpack your measuring cup.
- Baking powder: Helps the cake lift so it doesn’t bake up heavy, especially in a bundt pan.
- Baking soda: This works with the sour cream to give a little extra rise and tenderness.
- Kosher salt: Coffee cake needs salt to taste like anything other than sugar and butter. Don’t skip it.
- Unsalted butter: Use softened butter so it creams well with the sugars. If it’s still cold, you’ll fight with lumps.
- Granulated sugar: This sweetens and keeps the crumb light when you cream it with the butter.
- Light brown sugar: Adds moisture and that deeper caramel note that makes this cake stand out.
- Eggs: Room temp eggs mix in smoother. Cold eggs can make the batter look curdled for a bit.
- Vanilla extract: I use real vanilla extract here. It rounds out the rum and brown sugar flavors.
- Instant espresso powder (optional): This is subtle, not “coffee cake that tastes like coffee.” It just deepens the flavor.
- Dark rum: Use a rum you’d actually drink. If you want it milder, coffee liqueur is a really good swap.
- Sour cream: Full-fat sour cream gives the best texture. Greek yogurt works too if that’s what you have.
- Whole milk: Helps loosen the batter so it spreads easily in the pan and bakes evenly.
Rum Glaze
- Powdered sugar: This dissolves quickly and gives you a smooth drizzle without fuss.
- Dark rum: A couple spoonfuls is enough to make the glaze taste like rum without being sharp.
- Milk: Use just enough to get a pourable glaze. You can always add a tiny splash more if it’s too thick.
- Salt: Just a pinch makes the glaze taste more balanced and less one-note sweet.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F. Grease and flour a 10-cup bundt pan, or grease a 9×13-inch baking pan.
- Mix the dry ingredients: In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
- Make the streusel: In another bowl, mix the brown sugar, flour, cinnamon, and salt. Stir in the melted butter until clumpy, then fold in the pecans if you’re using them.
- Cream the butter and sugar: Beat the softened butter, granulated sugar, and brown sugar until light and fluffy, about 2 to 3 minutes.
- Add the eggs and vanilla: Beat in the eggs one at a time, mixing after each. Mix in the vanilla extract.
- Add the rum: If you’re using espresso powder, dissolve it in the rum first. Mix the rum (or rum-espresso mixture) into the batter.
- Mix the sour cream and milk: Stir the sour cream and milk together in a measuring cup or small bowl so it’s easy to pour.
- Add the dry ingredients: Add the dry ingredients in two additions, alternating with the sour cream mixture. Mix just until you don’t see dry flour.
- Layer the batter: Spread half of the batter in the pan. Sprinkle on half of the streusel.
- Finish the layers: Add the remaining batter and smooth it out, then top with the remaining streusel.
- Bake: Bake for 45 to 55 minutes, until a toothpick comes out clean and the center springs back when lightly pressed. If the top browns too fast, tent loosely with foil.
- Cool: Cool for about 15 minutes. Invert if using a bundt pan, or let the 9×13 cake cool in the pan.
- Make the glaze: Whisk together the powdered sugar, rum, milk, and a pinch of salt until smooth and pourable.
- Glaze the cake: Drizzle the glaze over the warm or room temperature cake, then slice and serve.
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
Grease the bundt pan really well. Streusel can stick, especially in the creases. I like a full grease-and-flour situation here, not just a quick spray.
Stop mixing as soon as the flour disappears. Once the dry ingredients go in, overmixing is what makes coffee cake turn a little tough.
Keep the streusel clumpy. If it looks like wet sand, you can squeeze it with your fingers a few times to make bigger chunks before you layer it on.
Tent with foil if the top is getting dark. Bundt cakes can brown fast at the edges and top. A loose foil tent fixes it without changing the bake.
Glaze thickness is personal. For a true drizzle, keep it thinner. If you want more of an icing look, use less milk and let it fall in thicker ribbons.
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
- Coffee or espresso: This is best with something strong, especially if you used the espresso powder in the batter. I usually do black coffee or an unsweetened latte.
- Fresh fruit: Strawberries, raspberries, or sliced peaches are nice on the side. It makes the plate feel less heavy.
- Whipped cream: A small spoonful of lightly sweetened whipped cream is good if you’re serving it as dessert instead of brunch.
- Extra glaze: If you like a sweeter slice, double the glaze and pass a little pitcher at the table. People can add as much as they want.
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 cake covered at room temperature for 2 to 3 days. I keep it under a cake dome or wrapped well so the crumb stays soft.
If you want it to last longer, store leftovers covered in the fridge for up to 4 days. Let slices sit out for a bit before eating, or warm them briefly so the cake softens back up.
You can also freeze individual portions or freeze the whole cake wrapped tightly. Thaw at room temperature or thaw in the fridge overnight if you’re planning ahead.
If you’re making it ahead for guests, I like to bake the cake the day before and glaze closer to serving. The glaze stays prettier that way.
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 use coffee liqueur instead of rum?
Yes. Coffee liqueur works well in both the batter and the glaze, and it’s a little milder than dark rum. I like it when I want more coffee flavor and less “spirit” flavor.
Can I swap the sour cream for Greek yogurt?
Definitely. Use full-fat Greek yogurt if you can. Nonfat works in a pinch, but the cake won’t be quite as rich.
How do I know when a bundt coffee cake is done?
I look for a few things: the top should spring back when you press it lightly, and a toothpick should come out clean. If your bundt pan is dark metal, start checking on the early side.
Can I add chocolate chips or nuts to the batter?
Yes. Mini chocolate chips are my favorite because they don’t sink as much, and chopped walnuts are great if you don’t have pecans. Keep add-ins to about a cup so the cake still slices cleanly.
Can I make this in a 9×13 pan instead of a bundt?
Yes, and it’s a little easier for casual serving. Bake it the same temperature and start checking around the 45-minute mark, since pans and ovens vary.
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
Brown Sugar Rum Coffee Cake
INGREDIENTS
Streusel
- 1 cup light brown sugar packed
- 1 cup all purpose flour
- 2 tsp ground cinnamon
- ¼ tsp kosher salt
- ½ cup unsalted butter melted
- ¾ cup chopped pecans optional.
Cake Batter
- 2.5 cups all purpose flour
- 2 tsp baking powder
- ½ tsp baking soda
- ¾ tsp kosher salt
- 1 cup unsalted butter softened
- 1.5 cups granulated sugar
- ½ cup light brown sugar packed
- 3 large eggs room temperature
- 2 tsp vanilla extract
- 1 tbsp instant espresso powder optional
- ¼ cup dark rum
- 1 cup sour cream room temperature
- ½ cup whole milk.
Rum Glaze
- 1 cup powdered sugar
- 2 tbsp dark rum
- 1 tbsp milk
- pinch of salt.
INSTRUCTIONS
Prep
- heat oven to 350 F
- grease and flour a 10 cup bundt pan or a 9 by 13 inch baking pan
- whisk flour baking powder baking soda and salt in a bowl.
Streusel
- mix brown sugar flour cinnamon and salt
- stir in melted butter until clumpy
- fold in pecans if using.
Batter and Assemble
- beat butter granulated sugar and brown sugar until light and fluffy
- beat in eggs one at a time then vanilla
- dissolve espresso powder in rum if using and mix in
- mix sour cream and milk together
- add dry ingredients to butter mixture in two additions alternating with sour cream mixture and mix just until combined
- spread half the batter in pan
- sprinkle half the streusel
- add remaining batter and top with remaining streusel.
Bake and Glaze
- bake until a toothpick comes out clean and center springs back 45 to 55 minutes
- cool 15 minutes then invert if using bundt or cool in pan for a sheet cake
- whisk powdered sugar rum milk and salt to a pourable glaze and drizzle over warm or room temperature cake.
