Easy Rhubarb Crisp Dessert

Featured in Irresistible Desserts.

This easy-to-make dessert features a vibrant rhubarb base tossed with cornstarch, sugar, and a hint of cinnamon, crowned by a golden crumble of oats, flour, and cold butter. Baked until crisp and bubbling, it delivers a wonderful contrast of tart and sweet flavors. Serve it warm after a 10-minute rest to let the filling thicken and meld. Perfect for celebrations or a cozy ending to a springtime meal, this treat pairs beautifully with vanilla ice cream. Make ahead and enjoy leftovers for up to two days at room temperature, keeping the oat topping crisp and delicious.

Casey
Updated on Sat, 24 May 2025 17:46:26 GMT
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This easy rhubarb crisp is my personal go to dessert whenever spring brings a bounty of fresh rhubarb. With a golden crisp topping that perfectly balances the tart fruit beneath this recipe is quick enough for a weeknight and crowd pleasing enough for holiday gatherings like Easter. Vanilla ice cream on top is truly the finishing touch and makes every bite feel nostalgic and special.

My first rhubarb crisp was made on a whim with grocery rhubarb and after one bite that tart sweet combo instantly became a family tradition. There is just something about warm crisp with melty ice cream that feels like summer at home.

Ingredients

  • Rhubarb: fresh or frozen gives this dessert its signature tang picking stalks that are firm and deep pink gives the best color and flavor
  • Cornstarch: helps thicken the fruit filling without making it gummy look for a fresh container for the most reliable thickening power
  • Sugar: sweetens the tart rhubarb do not try to reduce this or you will have a sour crisp
  • Ground cinnamon: adds cozy warmth and ties the fruit and crumble together choose a fragrant cinnamon for best results
  • Oats: create the classic crunchy topping quick oats work best for even texture while old fashioned will make a chunkier crisp
  • Flour: binds the topping choose all purpose flour and measure accurately to avoid a dry topping
  • Pinch of salt: balances flavors in the topping and brings out the sweetness use a fine salt for even seasoning
  • Cold butter: key for getting big delicious crumbles use straight from the fridge and cube it with a knife for easy mixing

Step-by-Step Instructions

Prep the Pan:
Butter a two quart casserole dish to prevent sticking and help the crisp serve up neatly later on
Make the Rhubarb Filling:
Stir together sliced rhubarb cornstarch sugar and cinnamon in a large bowl making sure all the fruit is evenly coated then spread the mixture in your prepared dish
Mix the Crumble Topping:
Combine oats flour sugar cinnamon and salt in a second bowl then add cold cubed butter use your fingers or a pastry cutter to work the butter in until the mixture forms thick loose crumbles similar to chunky cookie dough
Assemble and Bake:
Scatter the crumble topping evenly over the rhubarb layer making sure to cover most of the fruit place the dish in your hot oven and bake at four hundred degrees Fahrenheit for thirty five minutes until the top is golden brown and the filling bubbles at the edges
Rest and Serve:
Allow the crisp to cool on the counter for ten minutes this helps the filling set and gives you neater servings serve warm on its own or with a scoop of vanilla ice cream
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If I had to choose I would say oats are my favorite part the way they take on the buttery flavor and crisp up golden brown is just unbeatable. My kids always sneak a little extra crisp topping when I am not looking and those moments make this dish extra special for our table.

Storage tips

Store any leftover rhubarb crisp covered on the counter for one to two days. If you want it to last longer pop it in the refrigerator tightly covered. Reheat by placing leftovers in the oven at three hundred fifty degrees Fahrenheit for ten minutes so the topping stays crisp. Cold leftover crisp is also surprisingly tasty for breakfast.

Ingredient substitutions

If you have only old fashioned oats you can pulse them a few times in a food processor for a finer texture. Margarine can be used instead of butter as long as it is stick margarine not spread. If you are out of cornstarch plain flour works in the filling just dust it lightly over the rhubarb so it coats every piece.

Serving suggestions

A scoop of real vanilla ice cream makes this a dream dessert but it is also great with lightly sweetened whipped cream or even a thick spoonful of plain Greek yogurt for brunch. Sprinkle with extra cinnamon for a little spice or pair with strawberries if you want a classic combination.

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Cultural and seasonal notes

Rhubarb is often one of the first perennials to emerge in spring and its tart flavor was cherished before berries were in season. Crisps became especially popular for home cooks in the early twentieth century who wanted a simple dessert using whatever fruit was on hand. This timeless dish is a lovely taste of tradition and a great way to celebrate spring’s earliest harvest.

Frequently Asked Questions

→ Can I use frozen rhubarb?

Yes, measure frozen rhubarb before thawing. Thaw completely and carefully drain off excess liquid before using.

→ What type of oats work best?

Quick oats yield a finer crumble, but old fashioned oats can be pulsed in a food processor for a similar effect.

→ What should I use if I don’t have cornstarch?

You can substitute flour, just ensure it's well mixed into the rhubarb so it doesn't settle at the bottom.

→ How do I get a perfect crumble topping?

Use fridge-cold butter and cut it into the dry ingredients thoroughly until the mixture is crumbly and holds together lightly.

→ How should leftovers be stored?

Cover and keep on the counter for up to two days to maintain the crisp topping.

Easy Rhubarb Crisp Dessert

Tender rhubarb filling with a buttery oat crumble, perfect for spring gatherings and easy to prepare.

Prep Time
15 Minutes
Cook Time
35 Minutes
Total Time
50 Minutes
By: Casey


Difficulty: Easy

Cuisine: American

Yield: 6 Servings

Dietary: Vegetarian

Ingredients

→ Rhubarb Filling

01 2 pounds sliced rhubarb, fresh or frozen
02 ¼ cup cornstarch
03 ¾ cup sugar
04 ½ teaspoon ground cinnamon

→ Crumble Topping

05 1 cup oats
06 ½ cup flour
07 ½ cup sugar
08 ½ teaspoon ground cinnamon
09 1 pinch salt
10 1 stick cold butter, cubed (8 tablespoons or ½ cup)

Instructions

Step 01

Preheat the oven to 400°F. Lightly butter a 2-quart casserole dish.

Step 02

In a large bowl, combine all rhubarb filling ingredients. Evenly spread the mixture in the prepared casserole dish.

Step 03

In a large bowl, mix oats, flour, sugar, cinnamon, and salt. Cut in the cold butter until the mixture forms crumbs.

Step 04

Scatter the crumble topping evenly over the rhubarb filling. Bake in the oven for about 35 minutes, or until the topping is golden and the filling is bubbly. Let rest on the counter for 10 minutes before serving.

Notes

  1. If using frozen rhubarb, measure it while frozen, then thaw completely and drain carefully without squeezing. Add an extra tablespoon of cornstarch if the rhubarb feels very wet.
  2. Quick oats are preferred for a finer texture, but old-fashioned oats can also be used after pulsing a few times in a food processor.
  3. Ensure the butter is fridge-cold for the crumble topping. If substituting margarine, only use stick margarine for optimal results.
  4. Allowing the crisp to rest for 10 minutes after baking helps the filling thicken properly.

Tools You'll Need

  • 2-quart casserole dish
  • Large mixing bowls
  • Oven

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Contains dairy (butter)
  • Contains gluten (flour, oats)

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: ~
  • Total Fat: ~
  • Total Carbohydrate: ~
  • Protein: ~