Moist Keto Lemon Pound Cake

This keto lemon pound cake is the low-carb answer when a citrus craving hits and you want something that tastes like real bakery cake, not a dry almond-flour experiment. It bakes up buttery, bright with fresh lemon, and tender enough to eat plain.

The crumb holds together beautifully for slicing, and it stays moist for days without any weird aftertaste. If you have been burned by keto desserts before, this one lands differently.

What Makes This Pound Cake So Good

The crumb is tight but not heavy, with a fine, velvety chew that slices cleanly without crumbling. Fresh lemon zest and juice cut through the richness so each bite tastes clean and sunny, not cloying.

Sour cream does the heavy lifting for moisture. Unlike many keto cakes that turn dry and crumbly by day two, this one stays tender for days. I skip the glaze on purpose here because the cake does not need it, but you can add one if you like (see the FAQ).

Ingredients

• 2 cups super-fine blanched almond flour: spoon and level, do not pack
• 1/4 cup coconut flour: do not skip it, it balances the texture
• 1 cup granulated erythritol sweetener (such as Swerve): measures like sugar
• 1 tbsp baking powder
• 1/2 tsp fine salt
• 1/2 cup unsalted butter, softened: leave it out until it yields to gentle pressure
• 4 large eggs, at room temperature
• 1/2 cup full-fat sour cream
• 2 tbsp lemon zest (from about 2 lemons)
• 3 tbsp fresh lemon juice
• 1 tsp vanilla extract

Variations / Substitutions

• Dairy-free: swap the butter with a stick-style plant butter and use full-fat coconut cream in place of sour cream. The cake will be slightly less rich but still tender.
• Lime instead of lemon: use lime zest and juice for a zippy change; the sweetness level stays the same.
• Sweetener swap: monk fruit sweetener works, but avoid stevia-only blends, which can taste bitter when baked.

If you like citrusy keto treats, try my Keto Lemon Bars next.

How to Make Keto Lemon Pound Cake

Step 1: Mix the Dry Ingredients

Preheat your oven to 350°F (175°C) and line a 9-by-5-inch loaf pan with parchment paper, leaving a little overhang on the long sides so you can lift the cake out later. In a medium bowl, whisk the 2 cups almond flour, 1/4 cup coconut flour, 1 tbsp baking powder, and 1/2 tsp salt until no lumps remain, about 30 seconds.

The flours will look speckled with the baking powder and salt. A quick whisk now saves you from overworking the batter later, which would make the crumb tough.

Step 2: Cream the Butter and Sweetener

In a large bowl, beat the 1/2 cup softened butter and 1 cup sweetener with an electric mixer on medium speed for 2 to 3 minutes. Stop and scrape the bowl once so everything combines evenly. The mixture should look pale and fluffy, almost like frosting.

Creaming air into the butter and sweetener is what gives the cake its lift, so do not rush this step. The sweetener grains will not dissolve completely, and that is fine.

Step 3: Beat in the Eggs and Sour Cream

Add the 4 eggs one at a time, beating well after each addition, about 30 seconds per egg. Then beat in the 1/2 cup sour cream, 2 tbsp lemon zest, 3 tbsp lemon juice, and 1 tsp vanilla until the batter is smooth and slightly thickened.

The batter will look glossy and smell intensely lemony at this point. The sour cream cools the mixture down a little, which helps the flours blend in gently next.

Step 4: Fold in the Dry Ingredients and Bake

Add the dry flour mixture to the wet ingredients in two additions, folding with a flexible spatula just until no white streaks remain. Stop the moment the batter comes together. Scrape it into the prepared loaf pan, smooth the top, and bake for 50 to 55 minutes at 350°F (175°C).

The cake is done when the top is deeply golden, the edges pull slightly away from the pan, and a toothpick inserted in the center comes out with a few moist crumbs. About 10 minutes before the timer goes off, you will notice a crack forming down the middle, that is normal and expected.

Step 5: Slice and Serve

Let the cake cool in the pan on a wire rack for 15 minutes, then lift it out using the parchment and cool completely on the rack, about 30 minutes longer. Once cool, slice it into thick slabs and serve at room temperature.

The clean white crumb flecked with yellow zest looks beautiful against a dark plate. Dust the top lightly with powdered sweetener right before slicing if you want a bakery finish.

How to Get a Tender Crumb

• Bring eggs to room temperature fast by placing them in a bowl of warm tap water for 5 minutes before you start.: Cold eggs can make the butter seize and give you a denser crumb.
• Measure almond flour correctly.: Spoon it into the cup and sweep off the excess rather than scooping directly from the bag. Packing it in will dry out the cake.
• Do not open the oven door until at least 45 minutes have passed.: A rush of cool air can make the center sink.
• If your top browns too quickly, tent it loosely with foil after the 35-minute mark so the inside can finish baking without burning.

Bake times by pan size:

Storing Leftovers

• Refrigerate: in an airtight container for up to 5 days. Bring slices to room temperature for about 30 minutes before eating so the crumb relaxes and the lemon flavor pops.
• Freeze: the whole cooled cake or individual slices wrapped tightly for up to 3 months. Thaw overnight in the fridge.

Frequently Asked Questions

Can I substitute the coconut flour?

No, coconut flour absorbs moisture differently, and replacing it with more almond flour will give you a greasy, crumbly loaf that will not hold its shape. The small amount here makes the crumb more cake-like without tasting like coconut.

Can I add poppy seeds?

Yes, stir 1 to 2 tablespoons of poppy seeds into the batter along with the dry ingredients for a lemon-poppy seed twist.

Can I bake this in a bundt pan?

You can, but you will need to double the recipe to fill a 10-cup bundt pan, and the bake time will be closer to 55 to 65 minutes. Grease every crevice thoroughly so it releases cleanly.

Keto Lemon Pound 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: 273

Ingredients Method Notes

Ingredients

  

• 2 cups super-fine blanched almond flour
• 1/4 cup coconut flour
• 1 cup granulated erythritol sweetener (such as Swerve)
• 1 tbsp baking powder
• 1/2 tsp fine salt
• 1/2 cup unsalted butter, softened
• 4 large eggs, at room temperature
• 1/2 cup full-fat sour cream
• 2 tbsp lemon zest
• 3 tbsp fresh lemon juice
• 1 tsp vanilla extract

Method

 

1. Preheat oven to 350°F (175°C) and line a 9×5 loaf pan with parchment. Whisk almond flour, coconut flour, baking powder, and salt together.
2. Beat butter and sweetener on medium for 2 to 3 minutes until pale and fluffy.
3. Beat in eggs one at a time, then mix in sour cream, lemon zest, lemon juice, and vanilla.
4. Fold the dry mixture into the wet in two additions just until combined. Scrape into pan, smooth top, and bake 50 to 55 minutes until golden and a toothpick comes out with a few moist crumbs.
5. Cool in the pan 15 minutes, lift out, and cool fully on a rack before slicing.

Notes

Cooling time is not included in the prep or cook time. The crack on top is normal and part of the pound cake charm. If you want a little extra shine, brush the warm top with a thin coat of melted butter.