For best results, do not thaw the frozen berries before using. This will prevent the filling from becoming too watery. If you don't have apple pie spice, you can substitute with a mixture of cinnamon, nutmeg, and allspice. Feel free to adjust the amount of sugar to your liking, depending on the sweetness of the berries. Serve warm with a scoop of vanilla ice cream or a dollop of whipped cream for an extra indulgent treat.
Easy Three-Berry Crumble Slab Pie
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PREP TIME15 mins
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COOK TIME45 mins
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TOTAL TIME1 hrs 30 mins
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SERVING18 People
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VIEWS9
Imagine a rustic, crowd-pleasing dessert bursting with the vibrant flavors of mixed berries, baked into a convenient slab pie format. This recipe uses frozen berries for year-round enjoyment and features a buttery, oat-based crumble topping that adds the perfect textural contrast. Serve warm, and prepare to be delighted!
Ingridients
Adjust Servings
Nutrition
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Carbohydrate45 g
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Cholesterol12 mg
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Fiber3 g
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Protein3 g
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Saturated Fat4 g
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Sodium257 mg
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Sugar22 g
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Fat11 g
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Unsaturated Fat0 g
Follow The Directions
01
Step
5 mins
Preheat oven to 375 degrees F (190 degrees C). (Prep time: 5 minutes)
02
Step
10 mins
Lightly dust an 11x15-inch half-sheet pan with flour. Carefully place the 2 pie crusts into the bottom of the sheet pan, gently stretching and trimming the crusts to fit the bottom and up the sides of the pan. (Prep time: 10 minutes)
03
Step
5 mins
In a large bowl, combine the frozen mixed berries, granulated sugar, arrowroot powder, and salt. Stir gently to ensure the berries are evenly coated. (Prep time: 5 minutes)
04
Step
10 mins
In a medium bowl, combine the rolled oats, all-purpose flour, brown sugar, apple pie spice, and salt. Add the cold, cubed butter. Use a pastry blender or your fingertips to cut the butter into the dry ingredients until the mixture resembles coarse crumbs and the butter is evenly distributed. (Prep time: 10 minutes)
05
Step
5 mins
Pour the berry mixture evenly over the prepared pie crust in the sheet pan. Sprinkle the crumble topping evenly over the berry mixture. (Prep time: 5 minutes)
06
Step
50 mins
Bake in the preheated oven for 45 to 55 minutes, or until the crust is golden brown and the berry filling is bubbly. (Bake time: 45-55 minutes)
07
Step
40 mins
Remove from the oven and let cool on a wire rack for at least 30 to 45 minutes before serving. This allows the filling to set slightly. (Cooling time: 30-45 minutes)
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RECIPE REVIEWS
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Please Rate
Layne Feestwillms
Jun 29, 2025I love that I can use frozen berries. It makes this a perfect dessert any time of year.
Lionel Wilderman
Jun 29, 2025The slab pie format is genius! It's so much easier than making a traditional pie, and it feeds a crowd.
Brent Kautzer
Jun 29, 2025I made this for a potluck, and it was gone in minutes! The crumble topping is absolutely delicious.
Crystal Johnson
Jun 25, 2025This recipe is a lifesaver! It's so easy to throw together, and everyone always raves about it.