Crumbly Rhubarb Crisp Pie

Finding a dessert that perfectly bridges the gap between homey comfort food and impressive dinner party finale can feel impossible. After all, you want something that tastes amazing without spending hours in the kitchen, and it needs to work whether you’re feeding your family on a Tuesday night or hosting friends for the weekend.

Luckily, this rhubarb crisp pie checks all the boxes: it combines the best parts of a traditional pie and a fruit crisp, comes together quickly with straightforward ingredients, and works beautifully whether you’re using fresh garden rhubarb or the frozen stuff from your grocery store.

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What Kind of Rhubarb Should I Use?

Fresh rhubarb is always your best bet for this pie, and you’ll find it in season during spring and early summer at most grocery stores and farmers markets. The color of the stalks – whether they’re bright red, pink, or greenish – doesn’t actually affect the flavor much, so don’t worry if yours looks different than what you see in pictures. Just make sure to trim off and discard the leaves, as they’re toxic, and only use the stalks. If fresh rhubarb isn’t available, frozen rhubarb works just fine – just thaw it first and drain off any excess liquid so your pie doesn’t get soggy.

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Options for Substitutions

This rhubarb crisp pie is pretty forgiving when it comes to swaps:

• Pie shell: Store-bought works great, but if you have time, homemade pie crust adds a nice touch. You can also use a graham cracker crust for a different flavor profile.
• Rhubarb: If rhubarb isn’t in season or you want to mix things up, try combining it with strawberries (use 1 cup rhubarb and 1 cup strawberries). You can also use all strawberries, though you might want to reduce the sugar slightly since they’re sweeter.
• Brown sugar: Regular white sugar works fine in the topping if that’s all you have. You’ll lose a bit of that molasses flavor, but the crisp will still turn out tasty.
• Oats: Both old-fashioned and quick oats work here. If you don’t have oats, you can use all flour in the topping, though it won’t have quite the same texture.
• Butter: Coconut oil can replace butter in the topping if you need a dairy-free option. Use the same amount and make sure it’s solid before mixing.
• Vanilla: Almond extract makes a nice substitute if you want a different flavor note – just use the same amount.

Watch Out for These Mistakes While Baking

The biggest mistake when making rhubarb crisp pie is using rhubarb that’s too wet, which can make your filling watery and prevent it from setting properly – pat your rhubarb pieces dry with a paper towel before mixing them with the sugar and egg mixture.

Another common error is not blind-baking your pie shell for 10-15 minutes before adding the filling, which leads to a soggy bottom crust that nobody wants.

To get that perfect crumbly topping, make sure your butter is cold when you mix it with the flour, brown sugar, and oats – warm butter will create a paste instead of those nice crispy clusters.

Finally, resist the urge to cut into the pie right away, as letting it cool completely allows the filling to firm up and makes slicing much cleaner.

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What to Serve With Rhubarb Crisp Pie?

A big scoop of vanilla ice cream is pretty much mandatory with rhubarb crisp pie – the cold, creamy sweetness is perfect against the tart rhubarb and crunchy oat topping. If you’re not an ice cream person, a dollop of fresh whipped cream or even some Greek yogurt works great too. I love serving this pie after a simple dinner like roasted chicken or grilled pork chops, since the bright, fruity dessert is a nice contrast to savory main dishes. For a weekend brunch, slice up the pie and serve it alongside hot coffee or tea, and maybe some scrambled eggs and bacon to balance out the sweetness.

Storage Instructions

Store: Keep your rhubarb crisp pie covered loosely with foil or plastic wrap at room temperature for up to 2 days, or in the fridge for up to 5 days. The fridge helps the pie stay fresh longer, though the crisp topping might soften a bit.

Freeze: This pie freezes really well for up to 3 months. Wrap it tightly in plastic wrap and then in foil, or slice it first and freeze individual pieces for easy grab-and-go desserts. Let it thaw in the fridge overnight before serving.

Serve: If you want to crisp up the topping again after storing, just pop the pie in a 350°F oven for about 10-15 minutes. It tastes amazing warm with a scoop of vanilla ice cream on top!

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 2200-2500
• Protein: 20-25 g
• Fat: 85-100 g
• Carbohydrates: 350-400 g

Ingredients

For the base and filling:

• 1 pie shell (I use Pillsbury for a consistent flakey crust)
• 1 1/4 cups sugar
• 2 tbsp flour (I always use King Arthur all-purpose flour)
• 1 egg
• 3/4 tsp vanilla
• 2 cups rhubarb (cut into 1/2-inch pieces)

For the crisp topping:

• 3/4 cup flour
• 1/2 cup brown sugar (packed firmly for a deeper molasses flavor)
• 1/2 cup oats
• 1/2 cup butter (cold and cubed into 1/2-inch pieces)
• 1/2 tsp ground cinnamon

Step 1: Prepare the Pie Shell and Oven

• 1 pie shell

Preheat your oven to 350°F.

While the oven heats, remove the pie shell from the freezer and place it in a 9-inch pie plate.

Let it sit at room temperature for just a minute or two so it’s easier to work with, but keep it cold—this helps maintain that flaky texture you’re after.

Step 2: Make the Custard-Style Rhubarb Filling

• 1 1/4 cups sugar
• 2 tbsp flour
• 1 egg
• 3/4 tsp vanilla
• 2 cups rhubarb

In a medium bowl, whisk together the sugar, 2 tablespoons flour, egg, and vanilla until well combined—this creates a custard-like base that will help thicken the rhubarb filling as it bakes.

Fold in the cut rhubarb pieces gently, making sure everything is evenly coated.

I like to let this sit for just a minute so the sugar starts to draw out the rhubarb’s natural juices, which deepens the flavor.

Step 3: Prepare the Crisp Topping

• 3/4 cup flour
• 1/2 cup brown sugar
• 1/2 cup oats
• 1/2 cup butter
• 1/2 tsp ground cinnamon

In a separate bowl, combine the 3/4 cup flour, packed brown sugar, oats, and cinnamon.

Cut the cold, cubed butter into the dry mixture using a pastry cutter, two knives, or your fingertips, working until the mixture resembles coarse breadcrumbs with pea-sized clumps of butter still visible.

I find using cold butter straight from the fridge is the secret to getting that crumbly, crispy texture—the butter pieces create little pockets of crispness as they bake.

Step 4: Assemble and Bake

• rhubarb filling from Step 2
• crisp topping from Step 3

Pour the rhubarb filling from Step 2 into the prepared pie shell, spreading it evenly.

Distribute the crisp topping from Step 3 over the filling in an even layer, letting some of it mound slightly in the center—don’t pack it down, as you want it to stay crispy.

Bake at 350°F for about 1 hour, until the filling bubbles slightly at the edges and the topping is golden brown.

Step 5: Cool and Serve

Remove the pie from the oven and let it cool for at least 20-30 minutes before slicing.

This resting time allows the filling to set properly so each slice holds together beautifully.

Serve warm or at room temperature with vanilla ice cream or whipped cream if desired.

Crumbly Rhubarb Crisp Pie

Delicious Crumbly Rhubarb Crisp Pie recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 30 minutes mins

Cook Time 1 hour hr

Total Time 1 hour hr 30 minutes mins

Servings 8 slices

Calories 2350 kcal

Ingredients

  

For the base and filling::

• 1 pie shell (I use Pillsbury for a consistent flakey crust)
• 1 1/4 cups sugar
• 2 tbsp flour (I always use King Arthur all-purpose flour)
• 1 egg
• 3/4 tsp vanilla
• 2 cups rhubarb (cut into 1/2-inch pieces)

For the crisp topping::

• 3/4 cup flour
• 1/2 cup brown sugar (packed firmly for a deeper molasses flavor)
• 1/2 cup oats
• 1/2 cup butter (cold and cubed into 1/2-inch pieces)
• 1/2 tsp ground cinnamon

Instructions

 

• Preheat your oven to 350°F. While the oven heats, remove the pie shell from the freezer and place it in a 9-inch pie plate. Let it sit at room temperature for just a minute or two so it's easier to work with, but keep it cold—this helps maintain that flaky texture you're after.
• In a medium bowl, whisk together the sugar, 2 tablespoons flour, egg, and vanilla until well combined—this creates a custard-like base that will help thicken the rhubarb filling as it bakes. Fold in the cut rhubarb pieces gently, making sure everything is evenly coated. I like to let this sit for just a minute so the sugar starts to draw out the rhubarb's natural juices, which deepens the flavor.
• In a separate bowl, combine the 3/4 cup flour, packed brown sugar, oats, and cinnamon. Cut the cold, cubed butter into the dry mixture using a pastry cutter, two knives, or your fingertips, working until the mixture resembles coarse breadcrumbs with pea-sized clumps of butter still visible. I find using cold butter straight from the fridge is the secret to getting that crumbly, crispy texture—the butter pieces create little pockets of crispness as they bake.
• Pour the rhubarb filling from Step 2 into the prepared pie shell, spreading it evenly. Distribute the crisp topping from Step 3 over the filling in an even layer, letting some of it mound slightly in the center—don't pack it down, as you want it to stay crispy. Bake at 350°F for about 1 hour, until the filling bubbles slightly at the edges and the topping is golden brown.
• Remove the pie from the oven and let it cool for at least 20-30 minutes before slicing. This resting time allows the filling to set properly so each slice holds together beautifully. Serve warm or at room temperature with vanilla ice cream or whipped cream if desired.