Blackberry Swirl Coffee Cake with a Brown Sugar Streusel Topping

Blackberry Swirl Coffee Cake

If you have been looking for a reason to eat cake before noon, this blackberry swirl coffee cake is it.

It bakes up light and fluffy, hides a ribbon of homemade blackberry puree in the center, and finishes with a thick brown sugar topping that crackles just a little when you slice in.

Breakfast, brunch, or a slow afternoon with coffee, this cake earns its spot on the table every single time.

This Blackberry Swirl Coffee Cake Recipe is a simple yet elegant addition to any breakfast, brunch, or afternoon coffee break!

Some recipes are worth rearranging your whole morning for. This blackberry swirl coffee cake is one of them, and no, I am not exaggerating.

It arrives on the counter looking like it came straight out of a bakery case, and yet it comes together with one bowl of dry ingredients, one bowl of wet ingredients, and a blender cup of berries.

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The recipe first appeared on the blog in 2016 and was updated in 2018, and it has stayed a favorite ever since. The cake is light and fluffy, the blackberry puree bakes into soft, jammy swirls through the middle, and the sweet brown sugar topping turns into a crisp, buttery lid. Three layers of very good news in one pan.

My honest opinion is that coffee cake deserves a spot in the weekly rotation. Ideally next to a White Chocolate Raspberry Vanilla Latte, because the berry notes line up beautifully. I know a latte is not coffee cake. I am also not going to apologize for pairing them. (If you have never tried that combination, consider this your gentle nudge.)

Then there is the brown sugar topping. It is so good I would happily eat it as an entire cake on its own. Crumbly, buttery, cinnamon scented, and sweet without being heavy.

Every time I bake this, I set a little of the topping aside and then spend the next ten minutes talking myself out of eating it with a spoon. Success rate, mixed.

My own coffee cake habit started in college. I was finishing a paper I had put off for far too long, and my roommate dragged me out for coffee late at night because she insisted I needed fresh air and something sweet.

I ended up with a slice of coffee cake that was nowhere near as good as this one, and somehow it still felt like the best thing I had eaten all semester.

There is something about cake and coffee after dark that quietly fixes a rough week.

That is the appeal of coffee cake in general. It is a socially acceptable breakfast cake. Nobody questions it. Eight in the morning with coffee, ten with a second cup, or three in the afternoon when the day needs rescuing, it always fits.

What makes this version special is the fruit. Fresh blackberries in summer are wonderful, frozen berries work beautifully all year long, and either way the puree is little more than blended berries and a little sugar. The flavor stays bright and fresh instead of baking into something heavy.

It is also an excellent Easter brunch recipe, which is the sort of thing worth having in your back pocket when guests are coming and everyone expects something impressive. Slice it, stack it on a platter, and let people assume you spent all morning on it. Your secret is safe with me.

If you have never made a swirl cake before, you are in very good hands. There is no piping bag, no tricky folding, and no decorating skills required. You layer, you spread, and if you feel fancy you drag a knife through the batter for extra swirl. That is the whole trick, and it works every time.

One more thing worth saying out loud. This cake is forgiving. Room temperature ingredients help, but a rushed morning will not ruin it. The topping covers a multitude of sins, and the blackberry swirl makes even a slightly uneven slice look completely intentional.

Blackberry Swirl Coffee Cake is such an easy brunch recipe and one of the best coffee cake recipes!!!

Here is why this one stays in my rotation. You blend the berries, you stir the dry ingredients, you whisk the wet ingredients, you make the topping, and then you layer everything into one pan. No stand mixer, no chilling, no decorating.

It travels well too. A 9×9 baking dish of coffee cake is exactly the right size for a brunch table, a potluck, or a holiday morning with people drifting in and out of the kitchen. Serve it slightly warm, or let it cool completely and slice it into neat squares. Both are correct.

And the flavor has something for everyone. The berries keep it from being too sweet, the sour cream keeps the crumb tender, and the cinnamon in the topping makes the whole kitchen smell like a very good decision.

Blackberry Coffee Cake Tips & Tricks:

The blackberry swirl filling is refreshingly simple. Fresh blackberries and sugar, blended together. That is it.

If you want a smoother filling, strain the puree through a mesh sieve to remove the seeds. That step is completely optional. If seeds do not bother you, skip it and save yourself the extra dish.

Getting the filling into the center of the cake is easy too. Pour half the batter into the pan, spread the blackberry filling evenly over the top, then pour the remaining batter over the filling. Layer by layer, that is your swirl waiting to happen.

Blackberry Coffee Cake Tips & Tricks continued:

Want big, dramatic swirls? Run a knife or a toothpick through the batter after you add the top layer and the puree. A few lazy figure eights are all it takes.

One thing to know before you start. The brown sugar topping is less of a crumb topping and more of a thick brown sugar crust. It bakes into a sweet, slightly crisp layer that sits right on top of the cake. If that is exactly what you want, you are in luck.

If you would rather have a crumb cake topping, use the crumb topping from the Strawberry Crumb Cake Muffins recipe, and plan on doubling it for this coffee cake so every square gets a generous layer.

This cake is a lovely Easter brunch addition, and it plays well with a few coffee cake cousins, including the Strawberry Lemon Coffee Cake, the Dark Chocolate Toffee Coffee Cake, and the Apple Blueberry Coffee Cake.

Credit where it is due. The original recipe comes from Michelle, a baker who taught herself and who believes it is impossible to be upset while eating dessert, and who bakes with the goal of making everyone happy. Hard to argue with that philosophy, especially with a slice of this cake in hand.

Ingredients

You will need three simple groups of ingredients. Here is the full list.

For the blackberry swirl

• 1 1/2 cups fresh or frozen blackberries
• 1/4 cup sugar

For the coffee cake

• 2 cups all purpose flour
• 1/4 cup sugar
• 1/2 cup brown sugar
• 2 tsp baking powder
• 1/4 tsp salt
• 1 large egg
• 2/3 cup milk
• 1 1/2 tsp vanilla extract
• 1/2 cup sour cream, or Greek yogurt
• 1/3 cup melted butter

For the brown sugar topping

• 1 tsp cinnamon
• 1 cup flour
• 1 cup brown sugar
• 6 Tbsp cold butter

The sour cream can be swapped for Greek yogurt, and the cake still turns out tender and moist. If you keep both on hand, use whichever one you reach for first.

Instructions

1. Preheat the oven to 375 degrees and grease a 9×9 baking dish.
2. In a food processor or blender, blend the blackberries and sugar until smooth. Set the puree aside. If you do not like seeds, strain the puree through a mesh sieve. If seeds are fine, you can skip that step.
3. In a large bowl, sift together the flour, sugar, brown sugar, baking powder, and salt. Set aside.
4. In a separate bowl, whisk together the egg, milk, vanilla extract, and melted butter.
5. Make a well in the center of the dry ingredients and pour in the wet ingredients. Stir until just combined. Add the sour cream and fold it gently into the batter until just combined.
6. To make the brown sugar topping, mix the brown sugar, flour, and cinnamon together. Cut in the cold butter and mix until the topping looks like coarse crumbs.
7. Pour half the batter into the prepared pan, spreading it all the way to the edges. Spread the blackberry puree evenly over the batter. Top with the remaining batter. If you want extra swirl, use a knife or a toothpick to swirl the puree into the batter.
8. Spread the brown sugar topping over the batter.
9. Bake for 30 to 35 minutes, or until a cake tester inserted in the center comes out clean.
10. Allow the cake to cool before serving.

A cake tester that comes out clean is your signal to pull the pan. Use the lower end of the bake time as your first check and keep an eye on the center.

Recipe details

Let the cake cool before you slice it, then serve it with coffee, tea, or that White Chocolate Raspberry Vanilla Latte. Either way, this is breakfast done properly.

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Blackberry Swirl Coffee Cake If you have been looking for a reason to eat cake before noon, this blackberry swirl coffee cake is it. It bakes up light and fluffy, hides a ribbon of homemade blackberry puree in the center, and finishes with a thick brown sugar topping that crackles just a little when you slice in.

• Total Time: 50 min

Ingredients

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Blackberry Swirl
1 1/2 cups fresh or frozen blackberries
1/4 cup sugar

Coffee Cake
2 cups all purpose flour
1/4 cup sugar
1/2 cup brown sugar
2 tsp baking powder
1/4 tsp salt
1 egg, large
2/3 cup milk
1 1/2 tsp vanilla extract
1/2 cup sour cream, or Greek Yogurt
1/3 cup butter, melted

Brown Sugar Topping
1 tsp cinnamon
1 cup flour
1 cup brown sugar
6 Tbsp butter, cold

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Instructions

1-Preheat oven to 375 degrees and grease: Preheat oven to 375 degrees and grease a 9×9 baking dish.
2-In a food processor or blender, blend: In a food processor or blender, blend blackberries and sugar until smooth. Set aside (if you do not like seeds, strain the puree through a mesh sieve; if seeds are fine, you can skip this step).
3-In a large bowl, sift together flour,: In a large bowl, sift together flour, sugar, brown sugar, baking powder, and salt. Set aside.
4-In a separate bowl, whisk together egg,: In a separate bowl, whisk together egg, milk, vanilla extract, and melted butter.
5-Make a well in the center of: Make a well in the center of the dry ingredients and pour in the wet ingredients. Stir until just combined. Add in sour cream, and fold gently into the batter, stirring until just combined.
6-To make the brown sugar topping, mix: To make the brown sugar topping, mix brown sugar, flour, and cinnamon together. Cut in the butter and mix until the topping looks like coarse crumbs.
7-Pour half the batter into the prepared: Pour half the batter into the prepared pan, spreading the batter all the way to the edges. Spread the blackberry puree evenly over the batter. Top with remaining batter. Using a knife or toothpick, swirl the puree with the batter, if desired.
8-Spread the brown sugar topping over the: Spread the brown sugar topping over the batter.
9-Bake for 30-35 minutes, or until a: Bake for 30-35 minutes, or until a cake tester comes out clean.
10-Allow to cool before serving: Allow to cool before serving. Enjoy!

• Prep Time: 20 min
• Cook Time: 30 min
• Method: bake