I am going all out on my lemon theme for my home café lately—like seriously, I’ve been baking up a storm with all things citrus. I used to be a die-hard chocolate dessert kind of girl (and trust me, that love still runs deep), but recently I’ve become totally obsessed with lemon. It’s just so fresh, light, and perfect for summer.
This lemon crumb cake is no exception. It’s got three layers of lemon packed into one dreamy dessert. The base is a fluffy lemon cake made with sour cream for max tenderness. Then you’ve got a lemon sugar crumble topping (that’s almost candy-like in flavor), and finally, it’s finished with a lemony glaze that ties the whole thing together. If you’re a lemon lover—or even a recovering lemon hater like I was—you will be hooked. 💛
Ingredients:
Granulated Sugar:
Sweetens the cake, and when rubbed with lemon zest, creates an aromatic citrus sugar that adds bright flavor to every bite.Lemon Zest:
Zest carries natural oils that are far more fragrant and flavorful than the juice. Rubbing it into the sugar intensifies the lemon flavor without making the batter watery.Unsalted Butter:
Adds rich flavor and keeps the crumb tender and moist. Melted butter makes it easy to mix everything by hand—no mixer needed.Eggs:
Provide structure and help the cake rise. They also contribute to that soft, sponge-like crumb.Vanilla Extract:
Balances the brightness of the lemon and rounds out the flavor profile.Sour Cream:
Moisture queen! Sour cream adds tang and richness, while keeping the crumb fluffy and soft.Lemon Juice:
Fresh lemon juice is a must—it adds real, clean citrus flavor and balances the sweetness in both the cake and the glaze.All-Purpose Flour:
The foundation of the cake. Just enough to keep it fluffy but still sturdy enough to support the crumb topping.Baking Powder:
Leavening agent that gives the cake lift and airiness. Don’t skip it!Salt:
Essential to balance out the sweetness and enhance the lemon flavor.Powdered Sugar:
The crumble topping gets that signature soft, sweet finish with powdered sugar. And in the glaze, it creates the perfect drizzly consistency.
Why You’ll Love This Recipe
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It’s easy to make with no mixer required.
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Each bite is packed with bright lemon flavor—perfect for summer.
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The crumb topping is sweet, zesty, and slightly crunchy—a dream combo.
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You can serve it with coffee, tea, or as a post-dinner dessert.
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Great for brunch, potlucks, and yes… breakfast too. No judgment here.
What is Crumb Cake?
Crumb cake is like coffee cake’s extra-indulgent cousin. It’s made with a tender cake base and topped with a thick layer of crumble—usually buttery, sugary, and sometimes spiced. In this lemon version, the crumb is light, citrusy, and totally irresistible. It adds texture and flavor in a way that takes the whole cake up a notch.
Equipment Needed
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Mixing bowls: For the cake, crumb, and glaze—keep things organized and easy.
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Whisk or spatula: To mix everything without overworking the batter.
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Zester or Grater: For zesting the lemons.
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8×8 baking pan: Perfect size for thick, even cake slices.
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Parchment paper or nonstick spray: Keeps your cake from sticking and makes cleanup easy.
Substitution Modifications
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Greek yogurt can be used instead of sour cream. Just use full-fat for best results.
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Coconut oil can sub in for butter (use refined if you don’t want coconut flavor).
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For a dairy-free version, use dairy-free sour cream/yogurt and vegan butter.
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Swap lime zest + juice if you’re feeling tropical.
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Add blueberries into the batter for a lemon blueberry crumb cake!
Fluffy Lemon Crumb Cake – Easy Summer Coffee Cake with Zesty Crumble & Glaze
Ingredients
Cake
- ½ cup granulated sugar
- Zest of 1 lemon
- ½ cup unsalted butter, melted
- 2 large eggs
- 1 tsp vanilla extract
- ½ cup sour cream
- Juice of 1 lemon
- 11/2 cups all-purpose flour
- 2 tsp baking powder
- ½ tsp salt
Crumb Topping
- Zest of 1 lemon
- ½ cup all purpose flour
- ½ cup granulated sugar
- 3 tbsp unsalted butter, melted
Lemon Glaze
- ½ cup powdered sugar
- Juice of 1 lemon
Instructions
- Preheat oven to 350°F (175°C). Grease or line an 8×8-inch baking dish with parchment paper.
- Make lemon sugar: In a mixing bowl, combine the granulated sugar and the zest of one lemon. Use your fingers to rub the zest into the sugar until fragrant and the sugar looks pale yellow.
- Add wet ingredients: Stir in the melted butter, eggs, and vanilla extract until smooth and glossy.
- Add dairy + lemon: Stir in the sour cream and juice of one lemon until fully incorporated.
- Add dry ingredients: Sift in the flour, baking powder, and salt. Gently fold until just combined—don’t overmix!
- Pour batter into your prepared 8×8 pan and spread evenly.
- Make the crumb topping: In a small bowl, mix the flour, sugar and zest of the second lemon. Rub together with your fingers again for that infused flavor magic. Add the melted butter and stir until clumps form. Use your hands to crumble it evenly over the batter.
- Bake for 35–45 minutes, or until a toothpick inserted in the center comes out clean. Start checking at the 35-minute mark.
- Cool completely in the pan for about 1 hour.
- Make glaze: Whisk powdered sugar and lemon juice together until you get a smooth, drizzly consistency. Adjust with more sugar or juice as needed.
- Drizzle glaze over the cooled cake, then cut into 16 squares and enjoy!
Video
Nutrition
Tips & Tricks
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Room temp ingredients mix better and give you a more even bake.
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Rub that zest into the sugar—trust me, it makes all the difference!
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Don’t overmix once the flour goes in or your cake may turn dense.
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If your crumb topping starts browning too fast, tent with foil around 25–30 minutes.
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For clean slices, use a serrated knife and wipe between cuts.
Storage Instructions
Storage:
Keep in an airtight container at room temp for 2 days, or refrigerate for up to 5 days.
Freezing:
Wrap individual pieces tightly in plastic wrap and freeze in a zip-top bag for up to 2 months. Thaw overnight in the fridge or reheat gently in the microwave.
Reheating:
Microwave slices for 10–15 seconds for that fresh-baked taste. So good with a cup of coffee!
More of my recipes
Do you LOVE Lemon Desserts?! Check Out More of my Favs:Fluffy Lemon Rolls (With Lemon in the Dough, Filling & Frosting!) Better-Than-Starbucks Iced Lemon Loaf Bakery Style Lemon Blueberry Muffins with Crumble ToppingConclusion
Whether you’re hosting brunch, planning a picnic, or just need a sweet bite with your iced coffee, this Fluffy Lemon Crumb Cake is going to hit the spot. It’s bright, buttery, tender, and topped with the dreamiest lemon sugar crumble.
If you make this, tag me on Instagram or TikTok @munchiesbymallory—I LOVE seeing your recreations! And if you’re as lemon-obsessed as I am right now, check out more of my recipes on my blog!
Now go zest some lemons—you’ve got cake to make 🍋
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