Coconut Rhubarb Oat Crunch

Featured in: Sweet Treats for Every Occasion

Fresh rhubarb and coconut combine beneath a crumbly, buttery oat topping in this comforting dessert. Sweetened rhubarb is layered in a dish, then topped with a coconut-oat mixture and baked until golden brown and bubbly around the edges. The result is a warm, fragrant treat that pairs the tartness of rhubarb with the richness of coconut and brown sugar. Served warm or at room temperature, it's an inviting finish to any spring or summer meal.

sana kitchen chef
Updated on Thu, 05 Jun 2025 12:15:54 GMT
A white bowl with a cake in it. Pin it
A white bowl with a cake in it. | recipebyme.com

Coconut Rhubarb Crunch is my springtime secret for a show-stopping dessert that tastes like sunshine in a dish. The tartness of rhubarb gets cozy with brown sugar, oats, and plenty of coconut for a treat that is both comforting and fresh. Whether for a weekend family dinner or a casual gathering with friends, this easy bake never fails to impress. The smell of coconut mingling with bubbling fruit will soon have everyone peeking into the kitchen.

I remember the first time I brought this out at a potluck guests hovered around for seconds and the kids loved every sweet-tart bite. Every spring since I always look forward to the first rhubarb crop knowing this crunch will be on our table.

Ingredients

  • Fresh rhubarb: Diced into bite-size pieces adds refreshing tartness and bright color. Look for firm stalks with vivid red-pink hues.
  • Granulated sugar: Sweetens up the rhubarb and helps draw out its juices. Use cane sugar for a cleaner flavor.
  • All-purpose flour: Just a spoonful thickens the fruit filling a bit. Choose unbleached if you have it.
  • Vanilla extract: Ties the flavors together and makes the aroma warm and delicious. Use pure vanilla for more depth.
  • Melted butter: Both in the filling and topping makes the dessert rich and moist. Go for high-quality unsalted or European style if possible.
  • Brown sugar: In the topping lends a deep molasses note that complements rhubarb. Choose soft and moist brown sugar for easy mixing.
  • Rolled oats: Make the topping hearty and give it that classic crunch. Use old-fashioned oats for the best texture.
  • Shredded sweetened coconut: The star ingredient offering chewy texture and tropical flavor. Opt for fresh soft shreds not dried out bags.

Step-by-Step Instructions

Prepare the Filling:
In a large bowl combine the diced rhubarb with granulated sugar, a spoonful of flour, vanilla extract, and melted butter. Stir until all the fruit is coated and moist. You want to make sure the sugar and flour dissolve into the rhubarb juices so there are no lumps.
Layer the Filling:
Pour the rhubarb mixture into a well-greased nine by nine inch baking dish and spread it into an even layer. Make sure every corner has some fruit for balanced bites.
Mix the Topping:
In a new bowl mix together flour, brown sugar, rolled oats, shredded coconut, and the rest of the melted butter. Use your fingertips to break up any clumps until the mixture becomes crumbly and moist. Checking the feel of the topping here is important for a perfect golden crunch.
Add the Topping:
Sprinkle the topping evenly all over the rhubarb layer. Try not to press it down too hard so it stays crisp during baking. Cover all the fruit so none peeks out.
Bake:
Slide the dish into a preheated three hundred fifty degree oven. Bake uncovered for thirty-five to forty minutes. Watch for a bubbling edge and a golden top for the right doneness.
Cool and Serve:
Let the dessert cool for at least fifteen minutes before serving so it can set slightly. The juicy filling thickens up as it cools. You can serve it warm for extra comfort or at room temperature for easy slicing.
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A dish of food with a fork and spoon on top. | recipebyme.com

Sweet coconut is the sprinkle that keeps everyone coming back for seconds. Every time I bake with it I think of my grandmother who would sneak some into every fruit dessert because she liked how it turned chewy around the edges.

Storage Tips

After baking, let the coconut rhubarb crunch cool completely before covering the dish tightly with foil or plastic wrap. Pop the dish in the fridge and it will stay fresh for up to four days. For longer storage, you can freeze individual portions in airtight containers for several weeks. To reheat, bake uncovered at a low temperature to bring back the crisp topping rather than microwaving which can soften it.

Ingredient Substitutions

If rhubarb is not in season, you can use an equal amount of diced apples or strawberries for a new twist. For a gluten free version, use your favorite gluten free flour blend. Old-fashioned oats provide the best texture, but quick oats work in a pinch. For added flavor, a handful of chopped pecans or walnuts can be mixed into the topping. If sweetened coconut is too much, try unsweetened and add a bit more sugar to taste.

Serving Suggestions

A scoop of coconut rhubarb crunch is perfect on its own but takes on a whole new life with a generous spoonful of vanilla ice cream or a dollop of softly whipped cream. For a brunch treat, serve it warm alongside Greek yogurt with a sprinkle of cinnamon or toasted coconut. For parties, cut into bars for easy serving and pack in a picnic basket for the perfect sunny day treat.

A slice of cake with coconut on top. Pin it
A slice of cake with coconut on top. | recipebyme.com

Experiment with every batch. I sometimes swap in berries or add a pinch of cardamom for something new. There are endless ways to make this dessert your family’s signature spring treat.

Frequently Asked Questions

→ Can I use frozen rhubarb?

Yes, use frozen rhubarb without thawing. Add a little extra flour if there's excess moisture.

→ What type of coconut is best for this dessert?

Shredded sweetened coconut lends a chewy texture and adds pleasant sweetness to the topping.

→ Can this be served cold?

Absolutely. It's delicious at room temperature or chilled, though the topping is crunchiest when warm.

→ Is this suitable for making ahead?

Yes. Prepare and bake, then cool and cover. Warm briefly in the oven before serving for best texture.

→ How can I make the topping extra crisp?

Bake until deeply golden and bubbly at the edges, and let it cool slightly before serving to set the topping.

Coconut Rhubarb Oat Crunch

Tart rhubarb and coconut meet in a golden oat topping, baked until bubbly and irresistibly crisp.

Prep Time
15 Minutes
Cook Time
40 Minutes
Total Time
55 Minutes
By: Sana

Category: Desserts & Sweets

Difficulty: Easy

Cuisine: North American

Yield: 8 Servings (One 22×22 cm pan)

Dietary: Vegetarian

Ingredients

→ Filling

01 600 g diced fresh rhubarb
02 200 g granulated sugar
03 8 g all-purpose flour
04 5 ml vanilla extract
05 60 ml melted butter

→ Topping

06 120 g all-purpose flour
07 200 g packed brown sugar
08 45 g rolled oats
09 40 g shredded sweetened coconut
10 120 ml melted butter

Instructions

Step 01

Preheat the oven to 175°C.

Step 02

In a large mixing bowl, combine the diced rhubarb, granulated sugar, all-purpose flour, vanilla extract, and 60 ml melted butter. Mix thoroughly until all pieces are evenly coated.

Step 03

Transfer the rhubarb mixture into a greased 22×22 cm baking dish and spread out evenly.

Step 04

In a separate bowl, mix all-purpose flour, brown sugar, rolled oats, shredded sweetened coconut, and 120 ml melted butter. Stir until the mixture forms coarse crumbles.

Step 05

Sprinkle the prepared topping uniformly over the rhubarb base.

Step 06

Bake for 35–40 minutes, or until the surface is golden brown and the rhubarb is bubbling at the edges.


A dish of food with a fork and spoon on top.
Step 07

Remove from the oven and let cool for several minutes before serving.


A slice of cake with coconut on top.

Notes

  1. For best texture, use fresh rhubarb and avoid overmixing the topping to maintain a crumbly consistency.

Tools You'll Need

  • 22×22 cm baking dish
  • Mixing bowls
  • Wooden spoon
  • Oven
  • Measuring cups and spoons

Allergy Information

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

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 372
  • Total Fat: 14 g
  • Total Carbohydrate: 58 g
  • Protein: 3 g