Espresso Rum Brownies

Name: Espresso Rum Brownies
Prep time: 18 min
Cook time: 28 min
Total time: 46 min
Yield: 12 servings
Cuisine: Caribbean
Ingredients: 8 oz (227 g) unsalted butter; 6 oz (170 g) dark chocolate (60-70% cocoa), chopped; 2 tablespoons (7 g) espresso powder; 3 tablespoons (45 ml) dark rum; 3 (150 g) large eggs, at room temperature; 1 cup (200 g) granulated sugar; ½ cup (60 g) all-purpose flour; ¼ cup (23 g) unsweetened cocoa powder; ½ teaspoon (3 g) salt; 1 teaspoon (5 ml) pure vanilla extract

From the MyKitchenBank Kitchen

Dense, fudgy chocolate brownies infused with bold espresso and dark rum, balancing bitter coffee notes with warm rum spice. The Caribbean rum adds complexity while the espresso powder amplifies the chocolate's depth.

Prep: 18 min
Cook: 28 min
Wait: 32 min
Total: 1 hr 18 min
Makes: 12 brownies

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Steps

Before you start

Preheat oven to 350°F (175°C)
Line a 9×13 inch baking pan with parchment paper, letting it hang over two sides
Measure all ingredients and have them ready (mise en place)
Use room-temperature eggs for proper whisking and aeration

1
Preheat and prepareOven 350°F / 175°C
- Preheat oven to 350°F (175°C).
- Line a 9×13 inch (23×33 cm) baking pan with parchment paper, letting it extend over two opposite sides for easy removal.
- This makes lifting and cutting the brownies clean and simple.
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Ready when: Oven is fully preheated and pan is lined
Tip: Parchment overhang makes brownies easy to lift out without breaking; don't skip this step
2
Melt chocolate and butter
- Place the chopped dark chocolate and butter in a heatproof bowl.
- Set the bowl over a pot of simmering water (double boiler setup), making sure the bottom of the bowl doesn't touch the water.
- Stir occasionally until completely melted and smooth, about 2–3 minutes.
- Remove from heat and let cool for 1–2 minutes until no longer steaming.
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Ready when: Mixture is completely melted and silky with no lumps
Tip: Don't let the bowl get too hot or the chocolate may scorch; water should gently simmer, not boil
3
Bloom espresso and rum
- While the chocolate cools, pour the dark rum into a small bowl.
- Add the espresso powder and stir vigorously to combine.
- The espresso will partially dissolve into the rum, creating a dark, fragrant paste that blooms the coffee flavor.
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Ready when: Espresso powder is mostly dissolved and mixture is uniform dark brown
Tip: Blooming espresso in rum releases its full flavor; don't skip this step or mix it in later
4
Whisk eggs and sugar
- In a separate large bowl, whisk together the 3 room-temperature eggs and 1 cup granulated sugar.
- Whisk vigorously for 2–3 minutes until the mixture becomes pale, noticeably lighter in color, and nearly doubles in volume.
- The mixture should fall in thick ribbons from the whisk.
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Ready when: Mixture is pale, increased in volume, and falls in ribbons from the whisk
Tip: Whisking air into the eggs gives brownies a slightly lighter, fudgier crumb; don't skip this
5
Combine wet ingredients
- Pour the cooled chocolate-butter mixture into the egg-sugar mixture.
- Add the espresso-rum mixture and the vanilla extract.
- Using a rubber spatula, fold together gently with about 10–15 folds until just combined.
- The batter should be dark and glossy with no visible egg or chocolate streaks.
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Ready when: No streaks of egg or chocolate visible; batter is evenly dark brown
Tip: Overmixing develops gluten and makes brownies cake-like; fold gently and stop as soon as combined
6
Add dry ingredients
- Sift the all-purpose flour, unsweetened cocoa powder, and salt directly over the batter.
- Fold gently with a rubber spatula until no flour streaks remain, about 8–10 folds.
- The mixture should be uniform and dark with no white lines.
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Ready when: Dry ingredients are fully incorporated with no white streaks
Tip: Sifting the cocoa and flour prevents lumps; fold gently to keep the batter light
7
Transfer to pan
- Pour all the batter into the prepared 9×13 inch pan and spread evenly with a spatula so it reaches all corners and has an even thickness.
- Tap the pan firmly on the counter 3–4 times to release any large air bubbles trapped in the batter.
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Ready when: Batter is level and even throughout
Tip: Even spreading ensures uniform baking; use an offset spatula if you have one
8
BakeOven 350°F / 175°C
- Bake at 350°F (175°C) for 28–32 minutes.
- The brownies are done when the edges are set and beginning to pull away slightly from the sides of the pan, but the very center still has a slight jiggle when you gently shake the pan.
- A toothpick inserted into the center should come out with a few moist crumbs, not wet batter, and not completely clean.
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Ready when: Edges are set and pulling slightly away; center jiggles faintly; toothpick shows moist crumbs
Tip: Slightly underbaking is better than overbaking—they'll continue to set as they cool and will be fudgier
9
Cool in pan
- Remove the pan from the oven and let the brownies cool in the pan at room temperature for 30 minutes.
- The brownies will firm up and become much easier to cut cleanly without breaking apart.
- The pan will cool down gradually.
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Ready when: Pan is cool enough to touch comfortably; brownies are set but still warm
Tip: Resist the urge to cut them while still hot; they'll fall apart
10
Cut and serve
- Run a thin knife around any edges that haven't already separated from the pan.
- Lift the parchment overhang to remove the entire slab of brownies and place it on a cutting board.
- Using a sharp knife, cut into 12 squares (3 rows by 4 columns).
- Clean the knife between cuts for clean edges.
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Ready when: Brownies are cut into 12 even squares
Tip: A sharp knife dipped in hot water and wiped clean cuts brownies without dragging; chill the knife if needed

Good to know

Tips

Don't overmix once you combine the egg and chocolate mixtures—just fold until the batter is uniform. Overmixing develops gluten and makes brownies cake-like instead of fudgy.
Slightly underbaked brownies are better than overdone ones; they'll continue to set as they cool and will be noticeably fudgier the next day.
For extra rum depth, bloom the espresso in 4 tablespoons rum instead of 3, and reduce the flour by 1 tablespoon to compensate (not recommended for beginners).
For a sophisticated garnish, dust the cooled brownies with cocoa powder, or place a few toasted coffee beans on top of each square before serving.

Make ahead

These brownies can be made 1–2 days ahead. Wrap them individually in plastic wrap and store in an airtight container at room temperature.

Storage & reheating

Room temperature: 3–4 days in an airtight container, covered. Fridge: 5–7 days, wrapped individually. Freezer: 2–3 months, wrapped individually in plastic then foil. Reheat in a 300°F oven for 10–15 minutes until warm through, or microwave a single brownie for 20–30 seconds.

Substitutions

dark rum → Other dark spirits (bourbon, brandy, coffee liqueur) or omit and add 3 tablespoons strong brewed coffee or water. Bourbon adds oak spice, brandy adds fruitiness; coffee doubles down on espresso and adds depth without alcohol warmth
dark chocolate (60-70% cocoa) → Semi-sweet or milk chocolate. Reduces bitterness and chocolate intensity; good if you prefer sweeter brownies
espresso powder → Instant coffee (same amount) or finely ground coffee beans (same amount). Provides similar coffee flavor in a slightly less concentrated form
unsweetened cocoa powder → Dutch-process cocoa powder. Gives a deeper, earthier chocolate flavor with less acidity than natural cocoa