Apple Rhubarb Crisp (Easy, Crowd-Pleasing, and Perfect for a 9x13 Pan)

The Only Apple Rhubarb Crisp Recipe You Will Ever Need

There is something deeply comforting about a bubbling fruit crisp pulled hot from the oven. The smell alone, sweet and tart and buttery all at once, is enough to bring everyone into the kitchen. This apple rhubarb crisp is the kind of recipe that earns a permanent spot in your rotation. It is easy enough for a Tuesday night and impressive enough for a holiday table. It scales beautifully into a 9x13 pan, which means it feeds a crowd without any extra effort on your part.

Rhubarb has a bold, bracingly tart personality that can feel a little intimidating if you are new to baking with it. But paired with sweet, tender apples, it becomes something magical: jammy, vibrant, and perfectly balanced. Whether you are working with fresh stalks from the garden or pulling frozen rhubarb from the freezer, this recipe handles both with ease. This is one of those rhubarb crisp recipes that genuinely works for everyone at the table.

Why This Recipe Works So Well

Let's talk about what makes this particular crisp so reliable and so good.

• The fruit ratio is balanced. Four cups of rhubarb alongside four apples means you get tartness without pucker, and sweetness without cloying.
• Cornstarch thickens the filling. Without it, fruit crisps can turn soupy. A small amount of cornstarch transforms the fruit juices into a glossy, jammy filling that holds its shape beautifully.
• Cold butter in the topping is non-negotiable. Working cold, cubed butter into the oat and flour mixture creates those irresistible clumps that bake up crunchy and golden. This is the technique behind every great rhubarb crunch with a crumbly topping.
• The 9x13 pan is the right call. A larger pan means a thinner fruit layer and more surface area for topping, which translates to a better topping-to-fruit ratio in every single bite.

Chef's Tip: Do not skip the 10-minute rest after baking. The filling continues to thicken as it cools slightly, making it much easier to serve cleanly.

Using Frozen Rhubarb Without Ruining Your Crisp

One of the most common questions about rhubarb crisp using frozen rhubarb is whether it will make the filling watery. The honest answer: it absolutely can, but only if you skip one simple step. Thaw your frozen rhubarb completely, then drain it in a colander and pat it dry with paper towels. Removing that excess liquid is the difference between a perfectly set filling and a soggy disappointment.

Beyond that, frozen rhubarb behaves exactly the same as fresh in this recipe. No adjustments to sugar, cornstarch, or bake time are needed. This makes the recipe genuinely easy rhubarb crisp territory, no matter the season.

Having the right equipment genuinely elevates baking projects like this one. A quality 9x13 baking dish with good heat distribution ensures the filling cooks evenly, and a solid pastry cutter makes building that perfect crumbly topping effortless.

A Note on Sweeteners and Variations

This recipe uses a straightforward combination of granulated sugar in the filling and brown sugar in the topping. But there is real room to play here.

• For a maple-sweetened strawberry rhubarb crisp variation, swap the granulated sugar in the filling for 3 tablespoons of pure maple syrup and add one cup of halved strawberries alongside the rhubarb. The maple adds a warm, caramel-like depth that pairs beautifully with the fruit.
• If you want a 5-ingredient rhubarb crisp, pare back to just rhubarb, sugar, oats, butter, and flour. It is more rustic but still completely satisfying.
• A pinch of cardamom in the topping adds a beautiful floral note if you want to get creative.

Storage Tip: This crisp keeps in the refrigerator for up to 4 days. Reheat it in the oven at 325 degrees F for 12 to 15 minutes to bring the topping back to life.

Ready to bake? Here is everything you need to make this apple rhubarb crisp from start to finish:

Apple Rhubarb Crisp (Easy, Crowd-Pleasing, and Perfect for a 9x13 Pan)

This apple rhubarb crisp is the ultimate easy dessert, with tender, jammy fruit and a buttery, crumbly topping that bakes up golden and irresistible. Perfect for a 9x13 pan, it feeds a crowd and comes together in minutes.

Prep:20 mins

Cook:45 mins

Total:65 mins

Yield:12 servings

Cuisine:American

Yield: 12 servingsCalories: 310Protein: 3g

Carbs: 48gFat: 13gSat. Fat: 7gFiber: 3gSugar: 28gSodium: 95mg

Ingredients

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• 4 cups rhubarb, fresh or frozen, cut into 0.5-inch pieces
• 4 apples, peeled, cored, and sliced thin; Granny Smith or Honeycrisp recommended
• 3/4 cup granulated sugar, adjust to taste depending on apple sweetness
• 2 tbsp cornstarch
• 1 tsp vanilla extract, pure vanilla preferred
• 1 tbsp lemon juice, freshly squeezed
• 2 cups old-fashioned rolled oats, do not use instant oats
• 1 cup all-purpose flour
• 1 cup brown sugar, packed
• 1 tsp ground cinnamon
• 1/4 tsp ground nutmeg
• 3/4 cup unsalted butter, cold, cut into small cubes
• 1/4 tsp salt

Instruction

1

Preheat your oven to 375 degrees F (190 degrees C). Lightly grease a 9x13-inch baking dish with butter or nonstick spray.

2

If using frozen rhubarb, thaw it completely and drain off any excess liquid using a colander. Pat it dry with paper towels to prevent a watery filling.

3

In a large bowl, combine the rhubarb, sliced apples, granulated sugar, cornstarch, vanilla extract, and lemon juice. Toss well to coat every piece of fruit. Pour the filling evenly into the prepared 9x13 baking dish.

4

In a separate large bowl, stir together the rolled oats, flour, brown sugar, cinnamon, nutmeg, and salt until combined.

5

Add the cold cubed butter to the oat mixture. Using your fingertips or a pastry cutter, work the butter into the dry ingredients until the mixture resembles coarse, clumpy crumbs with some pea-sized pieces of butter remaining. Do not overwork it; the chunky texture is what creates that signature crispy, crumbly topping.

6

Spread the oat topping evenly over the fruit filling, covering it all the way to the edges of the pan.

7

Bake for 40 to 45 minutes, until the topping is deeply golden brown and the fruit filling is bubbling up around the edges.

8

Remove from the oven and let the crisp rest for at least 10 minutes before serving. This allows the filling to thicken up slightly. Serve warm with vanilla ice cream or whipped cream.

Equipment

• 9x13-inch baking dish
• Two large mixing bowls
• Pastry cutter or fork
• Colander (if using frozen rhubarb)
• Vegetable peeler
• Sharp chef's knife
• Cutting board
• Measuring cups and spoons

Notes

Store leftover crisp covered at room temperature for up to 1 day, or refrigerate for up to 4 days. Reheat individual portions in the microwave for 60 to 90 seconds, or warm the whole pan in a 325 degrees F oven for 15 minutes to re-crisp the topping. The assembled, unbaked crisp can be covered and refrigerated overnight; just add 5 minutes to the bake time straight from the fridge. For a maple-sweetened version, swap the granulated sugar in the filling for 3 tablespoons of pure maple syrup.

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Serving Suggestions

This crisp is wonderful on its own, but a few simple additions take it from great to unforgettable.

• Vanilla ice cream melting into the warm filling is the classic move for good reason.
• Lightly sweetened whipped cream adds an airy, creamy contrast.
• A drizzle of caramel sauce leans into the apple flavors and makes it feel a little more indulgent.
• Serve it for brunch alongside coffee, and no one will complain.

However you serve it, this apple rhubarb crisp is the kind of dessert that disappears fast. Consider doubling the batch.