Buttery Lemon Crumb Cake with a Tangy Lemon Glaze

This lemon crumb cake has a buttery, tender crumb and a thick, crisp topping that cracks under your fork. It’s bright from fresh lemon zest and just sweet enough, with a simple lemon glaze that drips into every nook.

The whole thing bakes in about 40 minutes and uses pantry staples you likely have on hand. It feels like a treat you’d save for a weekend, but it’s straightforward enough for a random Tuesday.

Why This Lemon Crumb Cake Works

The cake itself is soft and fine-crumbed, with just enough lemon to taste fresh without going sharp. Sour cream keeps it moist for days and gives the crumb a slight tang that balances the buttery topping.

That topping is the real star. It’s sandy and rich, studded with big crumble pieces that stay crisp even after the cake cools. The glaze adds a pop of bright citrus that cuts through the richness so every bite finishes clean.

Ingredients

• 1½ cups all-purpose flour: spoon and level it for the best cake texture
• 1 tsp baking powder
• ¼ tsp baking soda
• ½ tsp fine sea salt
• ½ cup unsalted butter, softened: let it sit out for 30 minutes so it creams easily
• ¾ cup granulated sugar
• 2 large eggs
• ½ cup full-fat sour cream: brings moisture and a subtle tang
• 2 tsp lemon zest: from about 2 lemons, packed lightly into the spoon
• 2 tbsp fresh lemon juice
• 1 tsp vanilla extract

Crumb Topping

• 1 cup all-purpose flour
• ⅔ cup packed light brown sugar: dark brown works too, just gives a deeper molasses note
• 1 tsp ground cinnamon: optional, but it adds a warm back note
• ¼ tsp fine sea salt
• 6 tbsp unsalted butter, melted

Glaze

• ½ cup powdered sugar
• 1 to 2 tbsp fresh lemon juice: start with 1 and add more for a thinner drizzle

Variations / Substitutions

• Meyer lemon: use Meyer lemon zest and juice for a softer, floral citrus flavor.
• Greek yogurt: swap the sour cream for an equal amount of full-fat plain Greek yogurt.
• Gluten-free: use a 1:1 gluten-free baking flour blend in both the cake and crumb topping.
• No glaze needed: the cake is still lovely on its own, the crumb adds enough texture and sweetness.

If you love citrus-forward bakes, these lemon poppy seed muffins have a similarly tender crumb and bright flavor.

How To Make Lemon Crumb Cake

Step 1: Mix the Crumb Topping

In a medium bowl, stir together the 1 cup flour, brown sugar, cinnamon, and salt. Pour in the 6 tablespoons melted butter and mix with a fork for about 1 minute, until the mixture looks like coarse, wet sand and clumps together when you press it between your fingers.

You’ll see small and large crumbles. The larger ones will bake into those crisp top pieces, so don’t break them all down.

Step 2: Cream the Butter and Sugar

Place the softened butter and granulated sugar in a large bowl. Using a hand mixer or stand mixer, beat on medium speed for about 2 minutes, until the mixture is pale and fluffy.

Scrape down the sides once. The butter should look noticeably lighter in color and feel airy, not dense.

Step 3: Add the Wet Ingredients

Beat in the eggs one at a time, mixing for about 30 seconds after each one just until incorporated. Add the sour cream, lemon zest, lemon juice, and vanilla. Mix for another 30 seconds on low speed until the batter is smooth and even yellow.

It may look slightly curdled from the lemon juice and sour cream, that’s fine. It will come together when you add the flour.

Step 4: Fold in the Dry Ingredients

Whisk the flour, baking powder, baking soda, and salt together in a separate bowl. Add half of this dry mixture to the wet ingredients and stir on low speed for about 15 seconds, just until streaks of flour remain. Add the rest and mix for 15 to 20 more seconds, stopping as soon as no dry patches are visible.

Scrape the bottom with a spatula to catch any hidden flour pockets. Overmixing will make the cake tough, so once it looks combined, stop.

Step 5: Layer and Bake the Cake

Preheat the oven to 350°F (175°C) and line an 8×8-inch metal baking pan with parchment paper, leaving overhang on two sides. Scrape the batter into the pan and spread it evenly with a spatula. Sprinkle the crumb topping over the entire surface, letting some larger clumps fall as they are.

Bake for 35 to 38 minutes, until a toothpick inserted in the center comes out clean or with a few moist crumbs. The top will be golden brown and the crumb pieces will look dry and set.

Step 6: Drizzle the Glaze

Let the cake cool in the pan on a wire rack for about 20 minutes. Whisk the powdered sugar with 1 tablespoon lemon juice until smooth, adding a little more juice if you want a thinner drizzle.

Lift the cake out using the parchment and drizzle the glaze back and forth over the top. Let it set for 10 minutes, then slice and serve. The glaze will set into a thin, crackly layer over the crumb.

Tips for the Best Lemon Crumb Cake

• Use room temperature butter and eggs so the batter stays smooth and traps more air. Pull them from the fridge about 30 minutes ahead.
• Spoon and level the flour for the cake layer. Scooping straight from the bag can pack in extra flour and make the cake dry.
• For extra-crisp crumb topping, press the mixture into small and large clumps before sprinkling it on, then chill the topping for 10 minutes while you make the batter.
• Check the cake at 35 minutes. The crumb topping can darken quickly, so if it’s getting too brown, tent a piece of foil loosely over the pan for the last few minutes.

Bake times by pan size:

Storing Leftovers

• Refrigerate: keep the cake tightly covered at room temperature for 2 days. After that, store it in the fridge for up to 4 days to keep the crumb topping from softening.
• Reheating: a quick 10-second zap in the microwave warms a slice just enough to make it taste freshly baked.
• Serve cold: the cake is still tender and the crumb stays crunchy right from the fridge.

Frequently Asked Questions

Can I use buttermilk instead of sour cream?

Yes, buttermilk works, but the cake will be slightly less tender. Cut the amount to ⅓ cup and add an extra tablespoon of flour to the dry ingredients.

My crumb topping sank into the cake. What happened?

The batter was probably too thin or overmixed. Make sure your butter and sugar are well creamed and avoid adding extra liquid, and spread the batter to the edges of the pan so it rises evenly.

Can I make this cake gluten-free?

You can. Use a 1:1 gluten-free baking flour that contains xanthan gum for both the cake and crumb topping, and the texture will be nearly the same.

Why did my cake come out dry?

Overbaking is the usual cause. Check for doneness at 35 minutes, a toothpick should come out with a few moist crumbs, not completely clean.

Lemon Crumb Cake Recipe

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 35 minutes mins

Total Time 50 minutes mins

Servings: 9 servings

Calories: 410

Ingredients Method Notes

Ingredients

  

• 1½ cups all-purpose flour
• 1 tsp baking powder
• ¼ tsp baking soda
• ½ tsp fine sea salt
• ½ cup unsalted butter, softened
• ¾ cup granulated sugar
• 2 large eggs
• ½ cup full-fat sour cream
• 2 tsp lemon zest
• 2 tbsp fresh lemon juice
• 1 tsp vanilla extract
• 1 cup all-purpose flour
• ⅔ cup packed light brown sugar
• 1 tsp ground cinnamon
• ¼ tsp fine sea salt
• 6 tbsp unsalted butter, melted
• ½ cup powdered sugar
• 1 to 2 tbsp fresh lemon juice

Method

 

1. Mix crumb topping: stir flour, brown sugar, cinnamon, salt, and melted butter with a fork until coarse clumps form.
2. Cream butter and sugar with a mixer on medium until pale and fluffy, about 2 minutes.
3. Beat in eggs one at a time, then sour cream, lemon zest, lemon juice, and vanilla, mixing until smooth.
4. Whisk dry ingredients together, then mix into the wet in two additions, stopping as soon as no dry streaks remain.
5. Spread batter in a parchment-lined 8×8-inch metal pan, top with crumb mixture, and bake at 350°F for 35-38 minutes until a toothpick comes out with a few moist crumbs.
6. Cool 20 minutes, whisk glaze, drizzle over the cake, let set 10 minutes, then slice.

Notes

Let the cake cool in the pan for 20 minutes before glazing so the drizzle doesn’t melt into the hot crumb. For the cleanest slices, use a serrated knife and wipe it between cuts.