Blueberry Pie Bars With Shortbread Crust Recipe

These incredible blueberry pie bars are made with fresh blueberries and are so delicious! Perfect with a side of vanilla ice cream or on it’s own!

Blueberry season in Brooklyn is a reminder that the simplest things are usually the best ones. My kids will eat fresh blueberries straight from the container before I even get them into a recipe, which means I have to move fast. These bars are what happens when I get there first.

The shortbread base doubles as the crumble topping — you make one dough, reserve a cup of it, press the rest into the pan, and scatter the reserved portion on top of the filling before the second bake. The filling is a simple sour cream custard with fresh blueberries folded in. It sets as it bakes and firms up fully as it cools. These are a 9×13 pan dessert — makes 12 bars, feeds a crowd, travels well, and freezes beautifully.

What ingredients do you need for these shortbread blueberry bars?

Crust & Topping

• 1 ½ cups all-purpose flour
• 3/4 cup granulated sugar
• pinch salt
• 3/4 cup cold butter cubed (1½ sticks)

Filling

• 3 cups fresh blueberries
• 2 eggs
• 1 cup sugar
• 1/3 cup all-purpose flour
• 1/2 cup sour cream
• pinch salt

Ingredient Notes

All-purpose flour (1½ cups for crust + ⅓ cup for filling): Two separate uses — measure them separately before you start. The crust flour goes into the shortbread; the filling flour thickens the custard so it sets firm enough to slice.

Granulated sugar (¾ cup for crust, 1 cup for filling): Again, two separate amounts. The crust sugar is less — shortbread shouldn’t be overly sweet. The filling sugar is more to balance the tartness of fresh blueberries.

Cold butter (¾ cup / 1½ sticks), cubed: Must be cold. Cold butter cut into flour creates the crumbly, sandy texture of shortbread. If the butter is warm or melted it will make the crust greasy and dense instead of crumbly. Cut it into small cubes and keep it in the fridge until the moment it goes in.

Fresh blueberries (3 cups): Fresh is strongly preferred here. Frozen blueberries release too much liquid as they bake and will make the filling watery and prevent it from setting properly. If you must use frozen, thaw and drain them thoroughly first and expect a slightly wetter result.

Eggs (2 large): Bind the filling and help it set to a sliceable texture as it bakes. Whisk them first before adding the other filling ingredients.

Sour cream (½ cup): The backbone of the custard filling. Adds tang, richness, and body. Full-fat gives the best texture. Greek yogurt can substitute in a pinch but the filling will be slightly thinner.

Salt (¼ tsp each, for crust and filling): Brings out the blueberry flavor and prevents both components from tasting flat. “Pinch” is too vague — measure it.

Recommended addition — lemon zest + juice: The original recipe doesn’t include lemon, but adding the zest of 1 lemon and 1 tsp lemon juice to the filling makes the blueberry flavor significantly more vivid. Fresh blueberry filling without acid can taste one-dimensionally sweet. Highly recommended.

How do you make these blueberry pie shortbread bars?

Step-by-Step Walkthrough

Step 1: Preheat and prep the pan. Preheat oven to 350°F. Grease a 9×13-inch baking dish or line it with parchment paper, leaving an overhang on the sides so you can lift the bars out cleanly for cutting. Parchment makes a meaningful difference here — the filling is sticky.

Step 2: Make the shortbread dough. Add 1½ cups flour, ¾ cup sugar, ¼ tsp salt, and ¾ cup cold cubed butter to a food processor. Pulse until the mixture resembles coarse, crumbly sand with some pea-sized pieces of butter remaining. Alternatively, cut the butter into the dry ingredients using a pastry cutter or two forks, or rub it in with your fingertips. Do not beat with an electric mixer — this will overwork the dough and melt the butter, producing a greasy result instead of a crumble.

Step 3: Reserve and press. Scoop out 1 cup of the shortbread mixture and set it aside — this is your crumble topping. Take the remaining dough and press it firmly and evenly into the bottom of the prepared pan. Use the flat bottom of a measuring cup to pack it tight and smooth.

Step 4: Par-bake the crust. Bake the crust at 350°F for 15 minutes, until just set and very lightly golden at the edges. This par-bake is what keeps the bottom crust from being soggy under the wet filling. Remove from the oven and set aside — leave the oven on.

Step 5: Make the filling. While the crust bakes, whisk 2 eggs in a large bowl until smooth. Add 1 cup sugar, ⅓ cup flour, ½ cup sour cream, and ¼ tsp salt. If using, add lemon zest and juice now. Whisk until well combined and no lumps remain. Gently fold in 3 cups of fresh blueberries — fold, don’t stir, to keep the berries mostly whole.

Step 6: Assemble. Spoon the blueberry filling over the warm par-baked crust and spread it gently into an even layer. Scatter the reserved 1 cup of shortbread crumble evenly over the top — don’t press it down. Leave it loose so it bakes into distinct crumble pieces rather than a solid crust.

Step 7: Bake. Bake at 350°F for 55–60 minutes, until the top is golden brown and the filling is set — it should not jiggle when you shake the pan. If the top is browning too fast before the filling is set, tent loosely with foil and continue baking.

Step 8: Cool completely before cutting. This is not optional. The filling is a custard — it needs to cool fully to set firm enough to slice into clean bars. Let the pan cool at room temperature for at least 1 hour, then refrigerate for another hour before cutting. If you cut warm bars you will get a soupy, collapsed filling. Use the parchment overhang to lift the whole slab onto a cutting board before slicing.

Tips

Fresh blueberries only. Frozen berries release too much liquid during baking and the filling won’t set properly. If fresh aren’t available, thaw frozen blueberries completely, drain them in a strainer for 30 minutes, and pat dry before using — expect a slightly softer result.

Keep the butter cold. Cold butter = crumbly shortbread. Warm butter = greasy dough. Cube it and return it to the fridge for 10 minutes before using if your kitchen is warm.

Use parchment with an overhang. You cannot cleanly cut and lift these bars from a greased pan without it. Line the pan before anything else goes in.

Don’t skip the par-bake. The filling is wet enough to make a raw crust soggy if it goes on unbaked dough. Fifteen minutes of par-baking is what keeps the bottom crust firm.

Add lemon to the filling. Zest of 1 lemon and 1 tsp juice, whisked in with the other filling ingredients. It doesn’t make the bars taste like lemon — it makes the blueberry taste more like blueberry.

Cool completely before cutting. The filling will look set when it comes out of the oven but it’s still soft. It needs at least 2 hours total (1 hour room temp + 1 hour refrigerated) to firm up to a sliceable texture. Patience here is worth it.

To freeze: Cool completely, cut into individual bars, wrap each one in plastic wrap then in foil. Freeze for up to 3 months. Thaw at room temperature for 1–2 hours or microwave for 30–45 seconds. They hold up well from frozen.

Variations

Lemon Blueberry Bars: Add zest of 2 lemons and 2 tbsp lemon juice to the filling. Add 1 tsp lemon extract to the crust dough. Finish with a simple lemon glaze (1 cup powdered sugar + 2–3 tbsp lemon juice) drizzled over cooled bars.

Peach Blueberry Bars: Replace 1 cup of blueberries with 1 cup of diced fresh peaches. The combination of the two fruits in the custard filling is excellent — the peach softens and almost melts into the filling while the blueberries hold their shape.

Mixed Berry Bars: Use a combination of blueberries, raspberries, and blackberries totaling 3 cups. The mixed berry filling is slightly more tart and the colors bleed together beautifully. Add lemon zest to keep the flavors distinct.

Brown Butter Shortbread Crust: Brown the butter first, then cool it until solid in the refrigerator before cubing and using in the crust. Brown butter shortbread has a nutty, caramel depth that pairs exceptionally well with blueberries.

Cream Cheese Filling: Reduce sour cream to ¼ cup and add 4 oz of softened cream cheese to the filling, beaten in before the eggs. The cream cheese version is denser, richer, and closer to a cheesecake bar texture.

Almond Shortbread Crust: Replace ¼ cup of the all-purpose flour in the crust with almond flour and add ½ tsp almond extract. The almond flavor pairs naturally with blueberries and gives the crust a slightly more complex, nutty character.

FAQs

If you like WARM treats like me, you can warm these Blueberry Pie Bars up in the microwave. From there, you can add a scoop of vanilla ice cream to them. So good!

These are the bars I make when I need something that travels — they pack well, hold up at room temperature for a few hours, and everyone reaches for seconds before I’ve even sat down. The freezer tip is real: I’ve pulled individually wrapped bars out of the freezer on a weeknight and warmed them in the microwave and they’re as good as fresh. If blueberries are your thing, the Air Fryer Blueberry Pop Tarts are a 20-minute option when you don’t want to wait an hour for the oven, and the Blueberry Cream Cheese Coffee Cake goes in the same direction as these bars — that sour cream and blueberry combination is hard to beat.

If you are looking for more amazing dessert recipes, be sure to check out this comprehensive list! 50+ Fun and Easy Dessert Recipes For Kids

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