Perfect Blueberry Pie
A blueberry pie with a filling that’s just right — juicy, not soupy, and thick enough to hold a clean slice. Make it in a cornmeal crust for the best flavor combination.
How to keep blueberry pie filling from being runny
The number one complaint about homemade blueberry pie is a filling that’s either runny and soupy or gloppy and pasty. What it comes down to is how much starch you use and how fully it cooks.
I use cornstarch because it’s widely available and holds up at high temperatures without breaking down.
I baked this pie three times, incrementally increasing the starch until I got just enough thickening to hold the berries together while keeping a nice juiciness in the filling.
How cornstarch thickens pie filling
Cornstarch gelatinizes — thickens the liquid — between 144°–180°F when mixed with water alone. But sugar raises that activation temperature, which means the filling needs to reach a full boil to gel properly. That’s actually convenient: it gives you a clear visual cue. Bake the pie until the juice at the very center is actively bubbling — not just a shimmer, actual bubbles.
Ingredients
Ingredient Notes
- Pie Crust – I love cornmeal pie crust with blueberries. See the section below for a selection of pie crust recipe links.
- Blueberries – Fresh or frozen blueberries work for this recipe. If you use frozen berries there’s no need to defrost them first.
- Corn Starch – To activate the starch, the juice in the pie must come to a full boil — look for active bubbling at the center..
- Lemon & Salt – Lemon zest and juice, along with a pinch of salt enhance the blueberry flavor.
Process Photos
Here’s what the recipe process looks like at each stage. Refer to the recipe card below for measurements and exact instructions.
- Roll half the pie dough to line the pie plate.
- Roll the other half of the dough to a 12″ round. Fold it and place it in the lined pan. Refrigerate the dough for at least 30 minutes to relax the gluten.
- Toss the blueberries with the sugar, starch, salt and lemon.
- Pour the blueberries into the pie shell.
- Brush egg wash around the edges and top with the other piece of dough.
- Set the pie plate onto a baking sheet and bake on the lowest rack of the oven. The baking sheet will catch any boil over and prevent the bottom crust from baking too fast.
- Bake until the juice in the center of the pie is actively bubbling. If the top of the pie is browning too fast lightly cover it with aluminum foil.
Which is the best crust for Blueberry Pie?
I think cornmeal and blueberries are natural flavor partners. I highly recommend my Cornmeal Crust for this pie.
If you want to go more traditional, make my flaky Pie Crust or use your favorite recipe, even store bought.
If you keep a sourdough starter make Sourdough Pie crust.
Serving & Storage
Wait a good 3-4 hours before slicing the pie. I know this is the hardest step, but the filling needs to cool down enough for the filling to gel. If you cut the pie too soon the berries will spill out of the crust.
Obviously, the pie is wonderful with a big scoop of vanilla ice cream.
The pie will keep at room temperature for 2-3 days. Cover where the pie is cut to keep the filling moist.
More Fruit Pies
Blueberry Recipes
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Perfect Blueberry Pie Recipe
Ingredients
- 1 recipe Cornmeal Pie Crust
- 8 oz granulated sugar (1 cup)
- 1 ½ oz corn starch (5 tablespoons)
- ½ teaspoon table salt
- 1 lemon (zest and juice)
- 32 oz blueberries (6 cups)
- 1 egg (for egg wash)
- granulated sugar for topping
Instructions
- Roll half the dough to line a 9" deep dish pie pan.
- Roll the other half of the dough to a 12" circle. Sprinkle a little flour over the circle and fold it in half. Sprinkle with flour again and fold in half again. Wrap the folded dough and set it into the lined pie pan. Refrigerate for 1 hour before filling. The dough can be rolled up to a day ahead and refrigerated. Preheat the oven to 350°F.
- In a large bowl, whisk together 8 oz granulated sugar, 1 ½ oz corn starch, ½ teaspoon table salt, finely grated zest and juice from 1 lemon. Add 32 oz blueberries and toss to evenly distribute the sugar and starch. Pour the blueberries into the pie shell.
- Brush the rim of the bottom crust with egg wash. Lay the top crust over the filling. Pinch the two crusts together to seal. Trim the excess dough and use your fingers or a fork to crimp the edges. Use the tip of a small paring knife to cut a 2" "x" in the middle of the top crust. Peel back the pieces of dough to make a vent hole.
- Brush the entire top crust of the pie with egg wash and generously sprinkle the pie with granulated sugar.
- Place the pie on a baking sheet and bake until the juices in the middle of the pie are bubbling. Make sure the juice all the way in the middle is bubbling. The juice needs to boil to activate the starch. Otherwise the filling will be runny. This takes about 1 hour.
- Remove the pie from the oven and allow to cool for at least 3 -4 hours before cutting.
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I baked this pie today. The good: it tastes great, not too sweet, not too tart. The cornmeal crust gives a nice crunch too. The bad: the pie did not set at all despite being baked at 350 in a convection oven for 68 minutes and until the middle was bubbling. I also used metric measurements for precision. When I cut it, it turned into blueberry soup. Not sure if baking at altitude was the issue but I’ve never had trouble with pies before. Really not sure where I went wrong.
I’m not an expert in altitude baking, but I do know that boiling happens at a lower temp at higher altitude. It could be your filling wasn’t really at boiling temp despite seeing bubbles. Try temping the middle of the filling. For the cornstarch to activate the filling needs to be about 203F. I would go with 212F (boiling) to be safe.
Thanks so much! I’m sure you’re right and I’ll try again for sure because the pie was indeed tasty.