Apple and Rhubarb Crisp (Gluten Free and Irresistibly Good)
This gluten free apple and rhubarb crisp is the ultimate tart-sweet comfort dessert, loaded with jammy fruit and a buttery, golden oat crumble topping that bakes up perfectly every single time.
The Only Apple and Rhubarb Crisp Recipe You Will Ever Need
There is something almost magical about the combination of tart rhubarb and sweet apple bubbling together under a golden, buttery crumble. This gluten free apple and rhubarb crisp is the kind of dessert that fills your kitchen with the most incredible smell and disappears from the pan before it even has a chance to cool. Whether you are a longtime fan of rhubarb recipes or just now discovering this wonderfully tangy stalk, this crisp is your new warm-weather (and honestly, any-weather) obsession.
It is simpler than a pie, more satisfying than a parfait, and completely accessible whether you are gluten free or not.
Why Apple and Rhubarb Are a Perfect Pair
Rhubarb is bracingly tart on its own, which is exactly why it needs a fruit partner. Apples bring natural sweetness, a little texture that holds up in the oven, and a familiar flavor that keeps things comforting rather than adventurous. Together, they create a filling that is jammy, glossy, and deeply flavorful without being candy-sweet.
This recipe sits at the intersection of several beloved classics. If you have ever made a strawberry rhubarb crisp, a berry crisp, or any number of gluten free crisps, this will feel immediately familiar. But the apple swap adds body and a warmth that makes this version feel especially cozy.
Chef's Tip: Granny Smith apples are the best choice here because their firmness and tartness complement the rhubarb without turning mushy during baking. Honeycrisp is a close second if you prefer a slightly sweeter profile.
Getting the Gluten Free Crumble Topping Just Right
The topping is everything in a crisp. A limp, sandy topping is a missed opportunity. A proper gluten free crumble topping should be thick, craggy, and golden, with clusters that shatter slightly when your spoon breaks through.
The secret to nailing a gluten free crumble topping (sometimes called a cobbler or clumble topping) is cold butter and a light hand. Work the butter into the oat and flour mixture just until you get coarse clumps. Resist the urge to overwork it into fine crumbs. Those bigger chunks are what create the satisfying texture on top.
Using certified gluten free rolled oats is non-negotiable if you are cooking for someone with celiac disease or a gluten sensitivity. Regular oats can be contaminated during processing, so always check the label.
Having the right kitchen tools makes a real difference when pulling together the crumble topping and prepping the fruit efficiently. A good pastry cutter and a reliable baking dish are worth the investment for recipes like this.
How to Build the Fruit Filling
The fruit filling comes together in minutes. Sliced rhubarb and apples get tossed with sugar, a little cornstarch, lemon juice, and vanilla. The cornstarch is the key to a filling that is thick and glossy rather than watery. As the crisp bakes, the juices bubble up, activate the starch, and set into a beautiful jammy sauce.
A few things to keep in mind:
- Do not skip the lemon juice. It brightens the entire filling and keeps the apples from browning.
- Slice the apples thin. Thicker slices will not soften fully in the time it takes the topping to brown.
- Taste your rhubarb. Some stalks are more tart than others. If yours are very sour, add an extra tablespoon of sugar to the filling.
This same filling formula works brilliantly as a base for strawberry rhubarb cobbler or any rhubarb recipes crisp variation you want to explore.
Ready to bake? Here is the complete recipe with all the details:
Apple and Rhubarb Crisp (Gluten Free and Irresistibly Good)
This gluten free apple and rhubarb crisp is the ultimate tart-sweet comfort dessert, loaded with jammy fruit and a buttery, golden oat crumble topping that bakes up perfectly every single time.
Ingredients
- 4 rhubarb stalks, trimmed and sliced into 0.5-inch pieces
- 3 apples, peeled, cored, and sliced thin (Granny Smith or Honeycrisp work great)
- 3/8 cup granulated sugar, for the fruit filling
- 2 tbsp cornstarch, helps thicken the fruit juices
- 1 tsp vanilla extract
- 1 tbsp lemon juice, freshly squeezed
- 1 1/2 cups gluten free rolled oats, certified gluten free
- 1/2 cup gluten free all-purpose flour, a blend with xanthan gum works best
- 1/2 cup brown sugar, packed
- 1 tsp ground cinnamon
- 1/4 tsp ground ginger, optional but recommended
- 1/4 tsp salt
- 6 tbsp unsalted butter, cold and cubed
Instruction
Preheat your oven to 375 degrees F (190 degrees C). Lightly grease a 9x13-inch baking dish or a similar 2.5-quart baking dish.
In a large bowl, combine the sliced rhubarb, sliced apples, granulated sugar, cornstarch, vanilla extract, and lemon juice. Toss until the fruit is evenly coated. Pour the mixture into your prepared baking dish and spread it into an even layer.
In a separate medium bowl, stir together the gluten free rolled oats, gluten free flour, brown sugar, cinnamon, ginger, and salt until well combined.
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. This is your crumble topping.
Scatter the crumble topping evenly over the fruit layer, covering it all the way to the edges.
Bake for 40 to 45 minutes, until the topping is deep golden brown and the fruit filling is bubbling up around the edges.
Remove from the oven and let the crisp rest for at least 10 minutes before serving. This allows the filling to set slightly so it is not too runny. Serve warm with vanilla ice cream or whipped cream.
Equipment
- 9x13-inch baking dish
- Large mixing bowl
- Medium mixing bowl
- Pastry cutter or fingertips
- Cutting board and sharp knife
- Vegetable peeler
Notes
Serving, Storing, and Making It Your Own
Serve this apple and rhubarb crisp warm, straight from the oven, with a generous scoop of vanilla ice cream melting over the top. A dollop of lightly sweetened whipped cream works beautifully too.
Want to mix it up? Try these easy variations:
- Add 1 cup of halved fresh strawberries to the filling for a strawberry rhubarb twist that nods to classic strawberry crisp recipes
- Stir a pinch of cardamom into the crumble for a floral, warming note
- Swap the apples for pears in the fall for a softer, more delicate crisp
- Add 0.25 cup of chopped pecans or walnuts to the topping for extra crunch
Leftovers reheat beautifully in the oven at 325 degrees F for about 15 minutes, which brings the topping back to life far better than the microwave. This crisp also makes a genuinely excellent breakfast the next morning alongside a cup of coffee. No judgment here.
