Blackberry Slab Pie Bars are a little slice of heaven ~ the flakey pastry, the jewel toned filling, and the sweet glaze all work together in this super user friendly dessert. Use frozen fruit or preserves when fresh berries aren’t available.
Give me a blackberry slab pie bar over over a slice of pie any day
They’re just so much more user friendly. You can pick these bars up with your hands, tote them around with you, bring ’em on a driving trip, to work, on a plane…what pie can do all that? And these bars are just as flaky, just as fruity and juicy as any pie. Plus they’ve got that sweet glaze layered over top ~ heavenly!
This is the perfect recipe for a pie-crust-a-phobe (like me!)
I used one of my favorite pastry doughs for these blackberry bars. It’s the dough I used in my Apricot Pie Recipe, and it’s easy to work with, super flaky, with a really lovely softness to it. It’s made with mostly butter and a little shortening which I think makes the difference. It bakes up firm enough so that you can eat these bars by hand, but still quite tender when you bit into it.
The dough is easy to roll and very forgiving
Just push it back together if it cracks, and dust with flour if it sticks. I like to roll it right on the parchment paper it will bake on, so there’s no tricky transfer to deal with, just slide the dough and paper right onto a baking sheet.
This kind of freeform slab pie doesn’t look like much in its whole form, it’s a little ragged, I admit. But just trim the ends a bit before slicing and no one will be the wiser.
how to make a quick blackberry filling for pie bars
These blackberry pie bars would be nothing without the fresh blackberry filling. I made a quick jammy filling by cooking down the berries on the stove with some sugar, lemon juice and thickener. Note: you can use a good blackberry jam or frozen berries to make your filling off season.
- Put rinsed berries in a saucepan, along with sugar, thickener, and lemon juice. Stir to combine.
- Cook over medium heat, stirring often to dissolve the sugar and allow the berries to release their juices.
- Mash the berries with a potato masher or fork and continue to cook for about 8 minutes, or until the consistency of a thin jam.
- Chill. It will thicken as it cools.
my favorite thickener for fruit fillings
For the thickener I’ve recently discovered Instant Clearjel, which is a supercharged thickener for pies and fruit fillings. It works like cornstarch, but so much better, and it gives you an added insurance that your fillings won’t be too thin or runny. In this case you definitely want to avoid a dribbly filling!
blackberries are healthy, delicious, and stunning!
Blackberries go through a beautiful color transformation when they’re cooked with lemon juice and sugar, the deep blueish purple becomes a brilliant magenta. It’s absolutely gorgeous oozing out of the layers of pastry dough. Like black raspberries, these berries are unsung superfoods, bursting with vitamins and cancer fighting antioxidants.
Please do try these blackberry slab pie bars, you won’t be disappointed
The flakey pastry, the brilliant filling, and the glaze all make this one of my new favorite desserts on the blog. I’ll be reinventing it many times going forward, and I’m definitely doing an apple version for you later this year, so keep an eye out for that.
freeze summer berries so you can make this later in the year ~
- Wash and dry your berries and lay them out in a single layer on a parchment lined baking sheet.
- Put the whole pan in the freezer until the berries are frozen solid, about an hour.
- Transfer the berries to a heavy duty zip lock freezer bag and put them back in the freezer. They’ll keep up to a year.
- Use straight from frozen in pies, jams, sauces, etc.
blackberry recipes to check out before you go!
- Blackberry Moscato Slushies
- An Easy Blackberry Jam Recipe
- Blackberry Sweet Rolls
- Blackberry Cobbler Bars
- Blackberry Fool
- No Churn Easy Blackberry Ice Cream
Blackberry Slab Pie Bars
Ingredients
pie crust
- 2 1/2 cups all purpose flour, plus more for rolling
- 1 tsp salt
- 3/4 cup unsalted butter, cold and cut in pieces
- 1/4 cup shortening (I used butter flavor Crisco)
- 1/4 cup ice water
egg wash
- 1 egg yolk mixed with 2 teaspoons water
filling
- 12 ounces fresh blackberries
- 1/2 cup sugar
- 2 tsp Instant Clearjel thickener (substitute 1 Tbsp cornstarch)
- juice of 1/2 lemon
glaze
- 1 cup confectioner's sugar, sifted
- water for thinning
Instructions
- Start by making the crust. Pulse the flour and salt a few times in a food processor to combine. Add the cold chunks of butter and shortening to the bowl and pulse about 20 times until the mixture is grainy.
- Add the ice water, a little at a time, while continuing to pulse, until the dough just comes together when you pinch it between your fingers. Stop the machine to check it. NOTE: you may not need all of the water, but I always do.
- Turn the dough out onto a floured surface and bring it together into a ball. If there is still any remaining dry flour make sure to knead that into the dough to get it all incorporated. If your dough is too sticky, add a touch more flour.
- Cut the ball of dough in half, form two flat rectangles, and wrap each one in plastic. Refrigerate the dough for 2 hours (or overnight) before rolling it out.
- While the dough is chilling make the filling. This step can also be made the day before if you like. Put the berries into a saucepan. Mix the sugar and Clearjel thickener together and add to pan along with the lemon juice. Starting on low and then increasing the heat to medium high, cook the berries until they start to soften and the sugar has dissolved. Mash the berries with a fork as they soften. Stir almost constantly.
- Cook for about 8 minutes, or until it’s the consistency of a runny jam. I like to mash most of the berries. Chill the filling until ready to use.
- Preheat the oven to 350F
- Lay out a sheet of parchment large enough for a baking sheet and lightly flour it. Roll out one of the pieces of dough to (roughly) a 9×13 rectangle. Don’t stress, if it’s close, that’s fine. It helps to let the dough rest for a few minutes to warm up slightly before trying to roll it out.
- Spoon the jam over the top, leaving about an inch all around free.
- Roll out the top crust, and carefully place over the jam filling, pressing down all around the edges to seal. if you’ve got excess dough you can roll it up a bit.
- Brush with the egg wash and bake for about 40 minutes until golden. Let cool before glazing.
- To make the glaze whisk or stir the sugar together with the water, a tablespoon at a time, until you get a glaze consistency. Brush it liberally over the top of the cooled pie. Let dry before slicing.
Nutrition
This recipe is yummy yummy! The crust is amazing and pretty easy too! I made the filling one day, then made crust the next. When I was ready to put it all together, I just let the dough get to room temp before rolling out, worked perfectly. This is going to be a totally ridiculous question but can these bars be frozen or will that make the crust soggy.
Loved this recipe. I used a frozen berry mix, which was delicious. Mine leaked a little, though. I think my berry mix was still too hot when I poured it on the crust. I’ll be sure to let it cool next time. I used the second half of my lemon as the liquid to make the glaze…really good! Thanks for the great recipe.
Thanks Rita ~ frozen berries can be really wet sometimes, too.
Hello! Looks so yummy! Any tips and recipe changes to make it gluten free? Thanks!
I would look up a reliable gluten free pie crust recipe and use that Marie.
Can I use pillsbury pie crust for this? Or a box pie crust?
You could, I’m sure, but just be aware that it won’t be as good 😉
Fantastic little dessert! We used frozen blueberries and cherries (pulsed in the food processor) for the filling and these little bars came out lovely. In place of the glaze, we did a quick dusting of powdered sugar on top and that did the trick. Pretty and delicious! I could imagine adding cinnamon to the powdered sugar topping and serving with a little scoop of french vanilla or salted caramel ice cream. We’ll be using this recipe again and again! Thank you!
Ooooh that scoop of caramel ice cream sounds pretty good right now 🙂 Thanks for the review!
Could you use raspberries instead of blackberries?
Yes, that would be delicious.
Hi
If I use premade jam, how much should I use?
You’ll have to use your judgement, and the photos as your guide. You’ll want a fairly thick layer on top of the dough.
Can you strain the seeds out of the berry mixture?
Hi Debbie ~ yes, you should be able to push the filling through a fine mesh strainer to get the seeds out! I’d do this while the mixture is still warm as it will thicken up and get harder to strain as it cools.
Yes, definitely.
I used to freeze blueberries using this method until I brought home a bunch of berries & didn’t have time to do it. So I stuck the plastic containers of berries right into the freezer. A few days later I dumped them into plastic bags. When I need them I rinse & use. Now that’s how I always freeze them. No need for the pre-freezer prep!
Good to know! I would think if the berries were dry with no moisture this would work fine.
I LOVE this freeform slab pie! And that filling is fantastic. We’re all about fresh fruit desserts and I can’t wait to give this a try. Looking forward to the apple version too! Pinned
Thanks Tricia, I’m looking forward to the apple version too!