Blueberry swamp pie is a delightfully messy dessert that pairs a streusel-topped blueberry filling with a creamy vanilla custard—truly the best of both worlds.
With spring only days away, I’m officially declaring it pie season. I enjoy pies year-round, but the arrival of fresh berry pies in spring always feels like a breath of fresh air after months of heavy winter vegetables.
The urge to bake is strong—I’m trying to make at least a few pies before the baby arrives, or at minimum stock the freezer with pie dough for easy future baking. There’s something comforting about having ready-made dough on hand.
This blueberry swamp pie was first made last year but didn’t get shared at the time, so here it is now—still one of my favorite ways to enjoy pie.
I first learned about swamp pie in Erin McDowell’s The Book on Pie. The name might not sound glamorous, but the concept is brilliant: it’s a fruit pie and a custard pie combined. You start with a par-baked all-butter crust, fill it with a fruity filling, and top it with either a second crust or streusel. I prefer the streusel because it creates nooks and crannies that the custard can fill, making each bite rich and creamy.
After the pie bakes until nearly done, a simple vanilla custard is whisked together and poured over the hot pie. It bakes into a silky top layer—almost like baking ice cream into the pie—and adds a luxurious custard finish. Serving with a scoop of ice cream is optional, but highly recommended.
What you’ll need
This pie has a few components, but each is straightforward and can be prepped ahead.
Crust: I prefer homemade all-butter crust for its superior flavor. It’s easier to make than many expect and can be prepared in advance, which helps when assembling the pie later.
Filling: A classic blueberry filling of fresh blueberries, lemon zest and juice, vanilla, sugar, a bit of flour for thickening, and salt. Mix these together and pour into the par-baked crust.
Streusel: I love streusel as a top layer because there’s no need to roll a second crust and it adds excellent texture. This streusel contains oats, all-purpose and whole wheat flours, brown sugar, baking powder, salt, cinnamon, and cold butter. It’s mixed by hand until large clumps form.
Custard: A simple mixture of heavy cream, brown sugar, an egg, and vanilla. Whisk it together and pour over the pie near the end of baking.
With the components ready, assembly is quick and the result is a rustic, luscious pie with a crisp streusel top and a creamy custard layer.
- For the pie crust
- 1.75 cups + 2 tbsp (225 g) all purpose flour
- ¼ + ? tsp fine sea salt
- 12 tbsp (170 g) cold unsalted butter, cut into ½-inch cubes
- 6 tbsp (90 g) ice water, plus more as needed
- For the blueberry filling
- 1 1/2 lb (680 g) fresh blueberries
- zest and juice of 1 lemon
- 1/2 cup (100 g) sugar
- 2 tsp vanilla
- 3 tbsp (23 g) all purpose flour
- 1/2 tsp fine sea salt
- For the streusel
- 1/2 cup (40 g) old fashioned oats
- 1/2 cup (60 g) all purpose flour
- 2 tbsp (15 g) whole wheat flour
- 1/4 cup (50 g) brown sugar
- 1/4 tsp baking powder
- 1/4 tsp fine sea salt
- 1/4 tsp ground cinnamon
- 4 tbsp (57 g) cold unsalted butter, cut into 1/2-inch cubes
- For the custard filling
- 3/4 cup (176 g) heavy cream
- 2 tbsp (27 g) brown sugar
- 1 large egg
- 1 tsp vanilla extract
- In a large bowl, whisk together the flour and sea salt. Add the butter cubes and toss to coat in the flour. Use your fingers or a pastry cutter to cut the butter into the dough until the largest pieces are pea-sized.
- Slowly add the ice water, a tablespoon at a time, mixing lightly after each addition. Add only enough water for the dough to start coming together.
- Form the dough into a 1-inch-thick disk, wrap tightly in plastic, and refrigerate at least 30 minutes or up to 2 days.
- Roll the chilled dough on a lightly floured surface to a 12-inch circle. Fit into a 9-inch deep-dish pie plate and crimp the edges. Dock the crust with a fork and chill at least another 30 minutes.
- Preheat oven to 425°F. Line the chilled crust with parchment and fill with pie weights. Bake 15-17 minutes until edges are set and lightly browned. Remove weights and parchment, return to oven 3-5 minutes until the bottom looks set. Cool completely.
- Toss blueberries with lemon zest and juice in a medium bowl. Stir in vanilla.
- Whisk together sugar, flour, and salt in a small bowl. Sprinkle over the blueberries and mix until evenly combined.
- Combine oats, flours, brown sugar, baking powder, salt, and cinnamon in a bowl. Add the cold butter and use your fingers or a pastry cutter to combine until large clumps form.
- Whisk together the heavy cream, brown sugar, egg, and vanilla in a medium bowl until smooth.
- Preheat oven to 375°F with a rack in the lower third.
- Place the par-baked crust on a parchment-lined baking sheet. Pour in the blueberry filling in an even layer, then sprinkle the streusel on top. Bake 35-40 minutes, until the berries are bubbling and the crust is golden.
- Remove the oven rack briefly and pour the custard mixture evenly over the hot pie so it seeps into the filling.
- Return the pie to the oven and bake 10-15 minutes more, until the custard is set around the edges but still slightly jiggly in the center. Cool completely before serving.
Enjoy this rustic, creamy blueberry swamp pie warm or at room temperature. It’s especially lovely with a scoop of ice cream or a dollop of whipped cream.