There is nothing more comforting than a warm slice of homemade mixed berry pie fresh from the oven. Bursting with juicy berries, blackberries, and strawberries, this easy fruit pie is topped with a buttery oatmeal crumble that adds the perfect crunch. Whether you're baking for a holiday dessert or just craving something sweet, this rustic pie is a simple yet impressive treat you will want to bake again and again.
This post is sponsored by Seal the Seasons, but the content and opinions expressed here are my own.
"***corn, dairy, cinnamon, and gluten allergy adaptation
Oh my, but this pie is wonderful!!! As you can see, I have a lot of food issue, and it's difficult to find desserts I can enjoy with my family.
For corn allergy - use ½ c. Of tapioca flour instead of cornstarch.
For dairy allergy - use Smart Balance instead of of butter. For wheat/gluten allergy - use O'Dough's frozen pie crust (it's unbelievably good!). For cinnamon allergy - substitute with ground cloves. We didn't like big chunks of strawberries so chopped them before adding.
Make everything else according to the recipe. It's so good…!!"
★★★★★- Linda
The first time I ate this heavenly oatmeal crumble topping was topped on a Cranberry Apple Casserole that my cousin made. It is a sweet and tart casserole with a gooey apple cranberry filling that is absolutely FANTASTIC!! I fell in love with it.
We make it for Thanksgiving and Christmas holidays. When I decided to create this mixed berry pie, I wanted the same crunchy oatmeal topping topping that compliments the fruit so well, rather than the typical pie crust topping.
I was so pleased with the results. The buttery crunch of the topping cuts some of the sweetness of the sweet and tart mixed berry filling, while the flaky pie crust ties all the flavors together. This really is a marvelous marriage of flavors. I hope you love it as much as we do. Enjoy! Xoxo -Katie.
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Steps
Follow these easy steps to make mixed berry pie with oatmeal crumble topping.
- Completely thaw out your frozen mixed berries. Drain any excess liquid.
- Preheat oven to 400 degrees. In a large mixing bowl, mix berries, sugar, cornstarch, lemon juice and vanilla. Toss until evenly coated.
- Pour berry filling into a 9 inch pie crust.
- Cut butter into slices. In a seperate mixing bowl, combine old-fashioned oats, brown sugar, cinnamon, all purpose flour, and butter slices.
- Mix with a pastry blender until pea sized clumps form.
- Sprinkle oatmeal crumble topping evenly over the mixed berries until completely covered.
- Bake for 30 minutes.
- Reduce the oven temperature to 350 and bake an additional 15-20 minutes. Cool for 2 hours at room temperature before serving.
*The full recipe with ingredient measurements is located at the bottom of the post in the recipe card.
Watch how to make
Serving tip
Resist the temptation to cut into this pie immediately. It is important not to skip cooling for 2-4 hours. Cooling it allows the filling to thicken.
Can you use frozen fruit in Pies?
Pies are a great way to use frozen fruit! Frozen fruit are frozen at their ripest point. They can be purchased year round regardless of the seasons at a much less price than the fresh fruit. They also require less work to work with because they are already cleaned and stemmed.
When baking with frozen fruit, you should allow 10 to 15 minutes of additional baking time unless you thaw out the fruit. In this recipe, I want you to thaw out your fruit to control the cooking results in the oven.
Do you need to refrigerate leftover mixed berry pie?
You can keep this mixed berry pie out at room temperature for up to 2 days.
Cover it with foil or saran wrap while storing. It will keep an additional 3 days in the refrigerator.
About the recipe
I used Seal the Seasons frozen mixed berries in this mixed berry pie with oatmeal crumble topping recipe. Seal the Seasons works with small local farms. The small farms harvest their produce at the ripest point. Seal the Seasons freezes their produce and sells them at your local grocery store such as Harris Teeter, Food Lion, Lowes Foods, and Whole Food.
This allows consumers to purchase local farms produce year round. It also allows family farms to make a reliable stream of income.
Did you know? Most fruit bought outside of the fresh seasons are from other foreign countries. Since 2000, approximately 21 percent of small family farms have had to close down. Seal the Seasons strives to give local family farmers economical opportunities to help them stay open for business.
When you make this mixed berry pie, tell me what you think in the comment section! I would love to hear back! My readers will too.
Also post your picture of your pie on Instagram or Facebook, and tag @aforkstale and @sealtheseasons with #aforkstale #sealtheseasons hashtags! I will share with my followers! xoxo!
📖 Recipe
Mixed Berry Pie with Oatmeal Crumble Topping
Equipment
- pastry blender
Ingredients
- 6 cups frozen mixed berries (blueberries, blackberries, and strawberries I use Seal the Seasons
- 1 cup sugar
- ¼ cup cornstarch
- 2 tablespoons lemon juice
- 1 teaspoon vanilla extract
- 9 inch deep dish pie crust
Oatmeal Crumble Topping
- 1 cup old-fashioned oats
- ¾ cup brown sugar
- ½ cup all purpose flour
- 1 teaspoon cinnamon
- 9 tablespoons salted butter
Instructions
- Completely thaw 6 cups frozen mixed berries. Drain any excess liquid.
- Preheat oven to 400 degrees.I n a large mixing bowl, mix berries, sugar, cornstarch, lemon juice and vanilla. Toss until evenly coated.6 cups frozen mixed berries (blueberries, blackberries, and strawberries, 1 cup sugar, ¼ cup cornstarch, 2 tablespoons lemon juice, 1 teaspoon vanilla extract
- Pour berry filling into a pie crust.9 inch deep dish pie crust
Create the Oatmeal Crumble Topping
- Cut butter into slices. In a seperate mixing bowl, combine old-fashioned oats, brown sugar, cinnamon, purpose flour, and butter slices.1 cup old-fashioned oats, ¾ cup brown sugar, 1 teaspoon cinnamon, 9 tablespoons salted butter, ½ cup all purpose flour
- Mix with a pastry blender until pea sized clumps form. Sprinkle oatmeal crumble topping evenly over the mixed berries until completely covered.
- Bake for 30 minutes.
- Reduce oven temperature to 350 and bake an additional 15-20 minutes. Cool for 2 hours at room temperature before serving.
Linda Griffith says
***corn, dairy, cinnamon, and gluten allergy adaptation
Oh my, but this pie is wonderful!!! As you can see, I have a lot of food issue, and it’s difficult to find desserts I can enjoy with my family.
For corn allergy - use 1/2 c. Of tapioca flour instead of cornstarch
For dairy allergy - use Smart Balance instead of of butter
For wheat/gluten allergy - use O’Dough’s frozen pie crust (it’s unbelievably good!)
For cinnamon allergy - substitute with ground cloves
We didn’t like big chunks of strawberries so chopped them before adding.
Make everything else according to the recipe. It’s so good…!!
Dianne says
Used 36 ounces fresh blueberries, 1/2 the sugar in the filling + zest of 1/2 lemon in the filling and 1/2 in the topping, bagged the vanilla & cinnamon, then 5 T of oil instead of butter in the topping. This was very good.
Christine says
Can I use Quick Oats in place of Old Fashion Oats?
Katie Crenshaw says
Yes, the Quick Oats will work also Christine. Hope you like it.
Marcellina says
What a delicious looking recipe! I love that you use frozen berries. This means berry pie whatever the season!
Lisa | Garlic & Zest says
This pie looks so luscious and fruity -- definitely my kind of dessert. I prefer things like this to chocolate any day!
Natalie says
This pie looks incredible. Love the berries and how you spiced it. I bet is super delicious. I must make this for my family.
Aimee Mars says
Crumble recipes are my favorite! I love how you turned it into a pie. It goes perfect with the berries.
Katherine says
What a divine crumble. A huge YES to including oats in the mix.
Paula Montenegro says
I completely agree about oats in the crumble mixture, it adds a lot of crunch and is delicious! This is a fantastic recipe. My favorite fruit pies are topped with crumble and this one looks amazing! Thanks for sharing.