Moist Coffee Loaf Cake with Coffee Glaze

If you need a coffee flavored cake that comes together without fuss, this moist loaf with a simple coffee glaze is the one. It has a deep, real espresso taste without any artificial shortcuts, and the sour cream keeps every slice tender for days.

You can stir the batter by hand or with a mixer, and the glaze comes together while the cake cools. It is the kind of snack cake that feels a little special but never demands much from you on a Wednesday night.

What Makes This Coffee Cake So Good

This loaf gets its bold coffee flavor from instant espresso dissolved in a small amount of hot water. That little trick gives you a concentrated coffee punch without adding extra liquid that could throw off the crumb, so the cake stays dense in the best way, soft and velvety, not dry.

The glaze on top is also made with instant coffee, so every bite has that bittersweet mocha note. It cracks just slightly when you slice it and then melts into the cake.

I keep coming back to this version because it is reliable. The edges get a little chewy, the center stays plush, and the whole thing comes together with ingredients I usually have in the pantry.

Ingredients

• 1 3/4 cups (220g) all-purpose flour: spooned and leveled, not scooped
• 1 tsp baking powder
• 1/2 tsp baking soda
• 1/4 tsp fine sea salt
• 1/2 cup (113g) unsalted butter, softened: let it sit out for an hour
• 3/4 cup (150g) granulated sugar
• 2 large eggs, at room temperature
• 2 tsp vanilla extract
• 1/2 cup (120g) sour cream, at room temperature: full fat works best
• 2 tbsp instant coffee granules: dissolved in 2 tbsp hot water and cooled
• 1 cup (120g) powdered sugar: for the glaze
• 1 tbsp instant coffee granules: dissolved in 1 tbsp hot water, cooled
• 2 to 3 tbsp whole milk or heavy cream: to thin the glaze

Variations / Substitutions

• Sour cream swap: Greek yogurt works in the same amount, but the cake may be slightly less rich.
• Butter swap: melted coconut oil can replace butter in a pinch, though the crumb will be a little heavier.
• Coffee strength: use decaf instant granules for a milder, evening-friendly cake or double the coffee granules if you want a more intense hit.
• Add-ins: fold in 1/2 cup chopped toasted walnuts or chocolate chips with the flour for a bit of crunch.

If you enjoy a coffee-chocolate duo, try our Double Chocolate Espresso Muffins next.

How to Make Coffee Loaf Cake

Step 1: Mix the Dry Ingredients

Preheat the oven to 350°F (175°C). Grease a 9×5-inch loaf pan and line it with parchment paper, leaving a little overhang on the long sides. In a medium bowl, whisk together 1 3/4 cups flour, 1 tsp baking powder, 1/2 tsp baking soda, and 1/4 tsp salt.

The mixture should look even and fluffy, with no lumps of baking powder. If you see any, just press them through a fine sieve or give everything a second quick whisk.

Step 2: Cream the Butter and Sugar

In a small bowl, dissolve 2 tbsp instant coffee granules in 2 tbsp hot water and set aside to cool for a few minutes. In a large bowl, beat 1/2 cup softened butter and 3/4 cup granulated sugar with a hand mixer on medium speed until pale and fluffy, about 2 minutes. Add the eggs one at a time, beating well after each, then mix in 2 tsp vanilla and the cooled coffee mixture.

At this stage the batter might look a little curdled because of the liquid coffee. That is completely fine, it will smooth out once the dry ingredients go in.

Step 3: Fold in the Dry and Sour Cream

With the mixer on low, add one third of the flour mixture and stir just until a few streaks remain. Mix in 1/2 cup sour cream, then add another third of the flour, mixing briefly. Fold in the last of the flour by hand with a spatula until no dry pockets remain, about 10 to 15 strokes. The batter will be thick and glossy, with a strong coffee scent.

Stopping the mixer early and finishing with a spatula helps you avoid a tough loaf. Overworking the flour at this point can make the cake dense in a heavy way, not the tender crumb you want.

Step 4: Bake the Loaf

Scrape the batter into the prepared pan and smooth the top. Bake on the center rack for 50 to 55 minutes. At the 45-minute mark, peak through the oven door, the top should be domed and deeply golden. A toothpick inserted in the center will come out with a few moist crumbs attached when it is ready.

If the top browns too fast, tent the pan loosely with foil for the last 15 minutes. The cake will pull away from the edges of the pan just slightly when it is done, and your kitchen will smell like a coffee shop.

Step 5: Drizzle with Coffee Glaze and Slice

Let the loaf cool in the pan for 10 minutes, then lift it out using the parchment and transfer to a wire rack to cool completely, about 1 hour. For the glaze, whisk together 1 cup powdered sugar, the second coffee mixture (1 tbsp instant coffee dissolved in 1 tbsp hot water and cooled), and 2 tbsp milk. Add a little more milk if needed, aiming for a thick but pourable consistency. Drizzle the glaze over the cooled loaf and let it set for 5 minutes before slicing.

Serve the slices while the glaze is still slightly soft, and you will get that satisfying contrast of sweet, crackly top and moist cake underneath.

Tips for the Best Coffee Loaf

• Bring all the fridge ingredients to room temperature before you start. Cold eggs or sour cream can cause the butter to seize and create a dense streak near the bottom.
• If you only have brewed coffee, reduce it on the stovetop until you have a concentrated syrup, then measure 2 tbsp. It will not be as intense as instant coffee paste, but it works.
• Let the loaf cool completely before glazing, or the glaze will melt and slide right off the warm surface.
• To freeze, wrap the unglazed loaf tightly in plastic and foil. Thaw it on the counter, then add the glaze fresh.

Bake times by pan:

Storing Leftover Coffee Loaf

• Refrigerate: Wrap the glazed loaf in plastic or store slices in an airtight container for up to 5 days. The cake actually tastes more mellow and espresso-forward the next day.
• Reheating: A few seconds in the microwave, maybe 15 seconds, revives the soft, fresh-baked texture without melting the glaze entirely.
• Serve Cold: Cold slices are great straight from the fridge with a hot cup of black coffee.

What to Serve with Coffee Loaf Cake

A scoop of lightly sweetened vanilla ice cream melts into the warm glaze and turns a slice into a proper dessert after dinner. For something lighter, a handful of fresh raspberries or sliced strawberries adds a tart note that cuts through the rich coffee flavor. If you are keeping it simple, a cold glass of milk is all you need.

Frequently Asked Questions

Can I use decaf instant coffee?

Yes, decaf instant granules work exactly the same way. Your cake will still have that roasted, toasty coffee taste minus the caffeine.

Why did my loaf sink in the middle?

It usually means the batter was overmixed or the oven door was opened too early. Mix until the flour just disappears and try not to peek until at least 40 minutes have passed.

Can I make this gluten-free?

A good 1 to 1 gluten free baking flour blend swaps in for the all purpose flour without any other changes. The texture may be a tiny bit crumbly, but the flavor stays rich.

How do I get a stronger coffee kick?

Double the amount of instant coffee in both the cake and the glaze. Dissolve 4 tbsp instant coffee in 3 tbsp hot water for the batter, and use 2 tbsp instant coffee with 1.5 tbsp hot water for the glaze.

Coffee Loaf Cake Recipe

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 55 minutes mins

Total Time 1 hour hr 10 minutes mins

Servings: 10 servings

Calories: 320

Ingredients Method Notes

Ingredients

  

• 1 3/4 cups (220g) all-purpose flour
• 1 tsp baking powder
• 1/2 tsp baking soda
• 1/4 tsp fine sea salt
• 1/2 cup (113g) unsalted butter, softened
• 3/4 cup (150g) granulated sugar
• 2 large eggs, at room temperature
• 2 tsp vanilla extract
• 1/2 cup (120g) sour cream, at room temperature
• 2 tbsp instant coffee granules, dissolved in 2 tbsp hot water and cooled
• 1 cup (120g) powdered sugar
• 1 tbsp instant coffee granules, dissolved in 1 tbsp hot water and cooled
• 2 to 3 tbsp whole milk or heavy cream

Method

 

1. Preheat oven to 350°F (175°C). Grease a 9×5-inch loaf pan and line with parchment. Whisk flour, baking powder, baking soda, and salt in a bowl.
2. Dissolve 2 tbsp instant coffee in 2 tbsp hot water and let cool. Beat butter and sugar until fluffy, about 2 minutes. Add eggs one at a time, then vanilla and cooled coffee mixture.
3. Mix in one third of the flour mixture on low, then add all the sour cream, another third of flour, and finally fold in the rest by hand with a spatula.
4. Scrape batter into pan; bake 50-55 minutes until golden and a toothpick comes out with moist crumbs. Cool in pan 10 minutes, then lift out and cool completely on a rack.
5. Whisk powdered sugar, the second dissolved coffee mixture, and 2 tbsp milk. Drizzle over cooled loaf, let set 5 minutes, and slice.

Notes

Cool the loaf fully before glazing, or the glaze will run off. Room temperature butter, eggs, and sour cream are key for a smooth batter. The cake slices cleanly when chilled for 15 minutes.