Blueberry Crumb Loaf is the kind of quick bread I make when I want a slice of cake but still want it to feel like a “loaf” I can cut and snack on all weekend. It’s moist, a little rich, and the cinnamon crumb on top is the best part.

The loaf itself bakes up soft and tender thanks to sour cream (or Greek yogurt), and the blueberries stay juicy and bright. I like the little bit of lemon zest in the batter when I have a lemon around, but it’s optional.

For me, this is a great one for late breakfast, afternoon coffee, or a simple dessert that doesn’t need frosting. It slices neatly once it’s cooled, and it’s easy to dress up with a quick powdered sugar glaze.

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Why You’ll Love This Recipe

Crumb topping: The buttery cinnamon crumble bakes into little crisp clumps, and it makes the loaf feel special without any extra work.

Tender, moist crumb: Sour cream (or Greek yogurt) keeps the inside soft and bakery-like, even on day two.

Works with fresh or frozen berries: Fresh is great, but I bake this all the time with frozen blueberries too.

Easy to slice and serve: It’s a neat loaf cake, not a messy coffee cake. Once it’s cool, the slices hold together really well.

Simple glaze option: You can leave it plain, or drizzle a quick glaze over the top when you want it a little sweeter.

Ingredients You’ll Need

Crumb Topping

All-purpose flour: I use regular flour here. It’s what makes the crumble hold together in little clumps instead of melting into the batter.

Light brown sugar: Packed brown sugar gives the topping that cozy caramel-y taste. Dark brown sugar works too if that’s what you have.
Ground cinnamon: This is the main flavor in the crumb topping, so use a cinnamon you actually like.

Salt: Don’t skip it. It keeps the topping from tasting flat.

Unsalted butter: Melted butter is what makes this easy—no cutting in cold butter. If you use salted butter, just go a little lighter on the added salt.

Loaf Batter

All-purpose flour: Regular flour gives the loaf enough structure to hold all the blueberries.
Baking powder: This does most of the lifting so the loaf rises nicely.

Baking soda: A little baking soda helps when you’re using sour cream or yogurt, and it keeps the crumb tender.
Salt: It makes the blueberry flavor pop and keeps the sweetness in check.
Unsalted butter: Softened butter gives you a richer, more cake-like loaf than oil. Let it sit out so it creams easily.

Granulated sugar: Keeps the loaf light and sweet without weighing it down.
Eggs: Room temp eggs mix in more smoothly, and the batter doesn’t look curdled.
Sour cream or plain Greek yogurt: This is the ingredient that keeps the loaf moist. I use whichever I have; both work.

Vanilla extract: Plain vanilla is perfect here. It makes the whole loaf taste more “finished.”
Lemon zest (optional): I like it with blueberries, especially if the berries are a little bland. Skip it if you want a more classic cinnamon-blueberry vibe.
Blueberries: Fresh or frozen both work. If you’re using frozen, keep them frozen until you fold them in so they don’t streak the batter purple.

All-purpose flour (for coating blueberries): This little bit helps the berries stay suspended instead of sinking to the bottom.

Optional Glaze

Powdered sugar: This makes a quick glaze with no fuss. Sift it if yours is very lumpy.
Milk or lemon juice: Milk keeps it simple and sweet, lemon juice makes it brighter. I pick based on whether I used lemon zest in the batter.

Salt: Just a pinch makes the glaze taste less one-note.

Recipe Instructions

Preheat the oven: Heat the oven to 350°F.
Prep the pan: Grease a 9 x 5-inch loaf pan, then line it with parchment paper, leaving an overhang so you can lift the loaf out later.
Keep frozen berries frozen: If you’re using frozen blueberries, keep them in the freezer until you’re ready to fold them into the batter.

Mix the crumb topping: Whisk the flour, brown sugar, cinnamon, and salt together. Stir in the melted butter until clumps form, then chill the topping while you make the batter.

Mix the dry ingredients: In a medium bowl, whisk the flour, baking powder, baking soda, and salt together.
Cream the butter and sugar: In a large bowl, beat the softened butter and granulated sugar until light and creamy.

Add the eggs: Beat in the eggs one at a time, mixing after each until combined.
Add the sour cream and vanilla: Mix in the sour cream (or yogurt), vanilla, and lemon zest (if using) until smooth.
Add the dry ingredients: Fold the dry ingredients into the wet ingredients just until you don’t see dry flour.

Fold in the blueberries: Toss the blueberries with a little flour, then gently fold them into the batter.
Bake: Spread the batter evenly in the pan. Sprinkle the crumb topping over the top and press it lightly, then bake for about 55 minutes, until a toothpick comes out clean or with a few moist crumbs and the center is around 200°F.

Cool: Cool the loaf in the pan for about 15 minutes, then lift it out using the parchment and cool completely before slicing.

Glaze: Whisk the powdered sugar, milk or lemon juice, and a pinch of salt into a thick drizzle, then drizzle over the cooled loaf.

Some of my tips!

This is the part that really makes a difference. If you only read one section, make it this one because this is where I share the little trick that helps the recipe turn out so well.

Recipe Tips & Tricks

Use room temperature eggs and dairy. It’s a small thing, but it really helps the batter mix smoothly. Cold sour cream can make the batter look a little lumpy and heavy.

Don’t overmix once the flour goes in. Stir just until the flour disappears, then stop. Overmixing is the easiest way to get a tighter, drier loaf.

Coat the blueberries in flour. It won’t “fix” every sinking berry, but it helps a lot. I also fold them in gently so I don’t crush them.

Tent with foil if the top is getting dark. If the crumb topping is browning too fast, lay a piece of foil loosely over the loaf for the last 15 minutes or so.

Check the center, not just the edges. A toothpick test is good, but I also like checking the internal temp. Around 200°F in the middle is a nice target for a loaf like this.

Add nuts if you like extra crunch. Chopped walnuts or pecans in the crumb topping are really good here. Just keep the pieces fairly small so the topping still holds together.

Make some touches!

There are plenty of easy ways to serve this depending on the occasion. Keep it simple, or add a few small touches to make it feel a little more special.

Serving Suggestions

Coffee or espresso: This is one of my favorite slices to have with coffee. The cinnamon crumb plays really well with a strong cup.
Fresh berries: A small bowl of extra blueberries or strawberries on the side is simple and nice, especially if you’re serving it for brunch.
Whipped cream: If you’re serving it as dessert, add a spoonful of lightly sweetened whipped cream. It keeps things easy and not too fussy.

Lemon tea: Hot tea with lemon is a good match if you add lemon zest to the batter. It’s a clean, cozy combo.

Save it for later

This section covers how to store leftovers and what parts of the recipe you can prepare ahead of time.

Storage and Make Ahead

Store the loaf airtight at room temperature for up to 2 days. I usually keep it covered on the counter if the kitchen isn’t too warm. The crumb topping stays the most crisp that way.

If you want it to last longer, refrigerate it for up to 5 days. I let slices sit out for a few minutes before eating, or warm them very briefly so the crumb softens a bit.

You can also freeze the loaf for up to 2 months, whole or in slices. Wrap it well, then thaw at room temperature or in the fridge overnight.

If you’re freezing it, I prefer to add the glaze after thawing. The glaze can soak in a bit during freezing, and it looks nicer when it’s fresh.

A few quick answers

This section covers a few extra details that may help before you head to the recipe card.

Recipe FAQs

Can I use frozen blueberries?

Yes. Keep them frozen until you’re ready to fold them in, and work quickly. If they thaw on the counter, they can bleed into the batter and make it streaky.

How do I know when the loaf is done?

A toothpick in the center should come out clean or with a few moist crumbs (not wet batter). If you like using a thermometer, the center of the loaf should be around 200°F.

Can I swap sour cream for Greek yogurt?

Yep, it’s a 1:1 swap. I use plain Greek yogurt when I don’t have sour cream, and the loaf still bakes up moist and tender.

Why did my blueberries sink to the bottom?

That can happen if the batter gets overmixed and thins out, or if the berries are very large and heavy. Tossing the berries with a little flour helps, and so does folding them in gently at the very end.

Can I add nuts to this loaf?

You can. I like adding chopped walnuts or pecans to the crumb topping for extra crunch. Keep the pieces small so the topping doesn’t fall off in big chunks when you slice.

Before you go, take a look at a few other recipes below the recipe card. They use similar ingredients in a different way and are worth saving too.

Blueberry Crumb Loaf

Moist blueberry loaf cake topped with a buttery cinnamon crumb

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Prep Time 20

Cook Time 55

Total Time 1 15

Servings 10