Rhubarb is one of my favorite things about spring, but it needs a teammate. On its own it can be brutally tart, and even the best rhubarb-only dessert can be a lot to take. This Apple Rhubarb Crisp is the version I've been making for years, and it works because the apples do exactly what rhubarb needs: they soften the sharp edges, add body to the filling, and bring just enough sweetness to let that rhubarb flavor actually shine. Topped with a salted oat streusel and served warm with a scoop of vanilla ice cream, this is the dessert I look forward to all spring.
What makes this different:
The sweet-tart balance in this crisp is sharp and satisfying: rhubarb brings the tang, apples add the body so the filling doesn't turn to mush, and salt in the streusel makes the whole thing taste more like itself. I've made this every spring since I first posted it, and it gets requested on repeat. It's the one I bring to potlucks when rhubarb is in season because the pan always comes back empty. This takes about 1 hour 5 minutes start to finish, most of it hands-off. If you're using frozen rhubarb, thaw it completely and drain off the extra liquid first.
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What I Learned Making This Recipe
Here's something I didn't fully appreciate until I'd made this a few times: rhubarb cooks faster than you'd expect, and it goes from firm to completely soft with almost no in-between stage. If it were the only fruit in this crisp, you'd end up with something closer to a fruit compote under a streusel. Good, but not what you're imagining when you picture a crisp. The apples are the fix. They hold their shape in the oven and give the filling somewhere to land. They also bring enough natural sweetness that you can dial back the added sugar without losing anything. The ratio in this recipe, twice as much rhubarb as apple, keeps the filling bright and tart rather than just apple-flavored.
The salt in the streusel is something I honestly missed for years. Reader Paige left a comment suggesting it, and I tested it that same week. She was absolutely right. Unsalted streusel sits on top of the fruit and does its own thing. Salted streusel actually becomes part of the dessert.
Ingredients & Substitutions
Ingredient Notes
- Rhubarb: The star of the show. Look for firm stalks that feel rigid when you pick them up, not floppy. Deep red stalks give you that gorgeous pink color in the filling, but green rhubarb tastes exactly the same and works just as well. If you're using frozen, thaw it completely and drain as much liquid as you can before you start. I'm serious about this one. Frozen rhubarb holds way more water than fresh, and if you skip the draining step, the filling will pool instead of thickening up the way you want.
- Apples: Use something firm that won't fall apart in the oven.Granny Smith is my personal favorite here, but Honeycrisp and Braeburn are both great. Avoid anything you know turns soft when it's cooked - those will dissolve into the filling instead of giving it that texture contrast you're looking for.
- Granulated sugar (filling): Sweetens the fruit and draws out the liquid to create the filling sauce. Half a cup gives you a noticeable tart edge, which I love. If your rhubarb is really sharp, bump it up to ¾ cup. If you want more tartness, dial it back to ⅓ cup. This is one of those recipes where adjusting to your taste won't break anything.
- Cornstarch: This is what thickens the juices as the filling bakes. Don't skip it. Without it, the filling stays liquid and you end up with a soggy bottom. Not the move.
- Old-fashioned oats: These give the streusel that toasty, crunchy texture. Quick oats technically work but they steam in the oven rather than getting crispy, and steel cut oats are too hard. Old-fashioned rolled oats are the ones you want.
- Brown sugar (streusel): The molasses in brown sugar adds a caramel depth that white sugar just doesn't have. You can sub white sugar in a pinch, but the streusel will taste a bit one-dimensional.
- Butter (streusel): Melted butter is what makes this streusel so easy to put together. It coats everything evenly and gives you that crunchy, sandy texture once it bakes. Use unsalted so you're in control of the salt level.
- All-purpose flour (streusel): Gives the streusel structure and helps it hold together. If you want to make this gluten-free, a 1:1 GF flour blend plus certified gluten-free oats works really well. The texture comes out very close to the original.
- Cinnamon: Don't skip this one. It pairs so well with both apples and rhubarb, and it's a big part of what makes this crisp smell incredible while it's baking.
- Salt (streusel): This is the new addition in this version, and it's a good one. Half a teaspoon sharpens the streusel flavor and makes it taste like it actually belongs with the fruit underneath it, not just sitting on top of it.
How to Make
- Make the streusel by combining oats, brown sugar, flour, cinnamon, salt, and melted butter in a bowl and stirring until it forms coarse, clumpy crumbs.
- Toss the rhubarb and apples with sugar and cornstarch until the fruit is evenly coated.
- Spread the fruit into a greased baking dish and top evenly with the streusel.
- Bake at 350°F for 50 minutes until the streusel is deep golden and the fruit juices are actively bubbling around the edges. Rest 15-20 minutes before serving
My best Tips
- Let it rest before serving. The filling is liquid when it comes out of the oven. I promise it will thicken up, but you have to give it time. Fifteen to twenty minutes lets the cornstarch do its job. Skip this step and your servings will pool everywhere. If you care at all about how it looks in the bowl, this one isn't optional.
- Watch for the bubble, not just the color. The streusel browns before the filling is fully cooked, so don't pull it out just because the top looks good. You want to see the fruit juices actively bubbling at the edges of the streusel, not just a hint of movement. If the topping is golden but the filling isn't bubbling yet, tent the dish loosely with foil and keep baking.
- Don't skip draining the frozen rhubarb. Frozen rhubarb releases so much more water than fresh. If you don't drain it first, the extra liquid won't cook off in 50 minutes and you'll end up with a wet, soupy filling. Thaw it completely, drain in a colander for at least 10 minutes, and if it still looks very wet, add an extra tablespoon of cornstarch to the filling.
- Your apple choice matters more than you think. A soft apple like McIntosh will just cook down and disappear into the rhubarb. A firm apple like Honeycrisp or Granny Smith holds up and gives you that texture contrast that makes this actually feel like a crisp. Both are good desserts, but only one is the one you're imagining.
- Double the streusel if you're a topping person. The recipe as written gives a solid streusel-to-fruit ratio, but if your favorite part of any crisp is the crunchy top layer, just double all the streusel ingredients. Same bake time. The fruit can handle it.
Make ahead, freezing and storage
Leftover crisp keeps covered in the refrigerator for up to 4 days. The streusel will soften as it sits, but the flavor holds up really well. To reheat, put the dish in a 325°F oven for 10 to 15 minutes loosely covered with foil, then uncover for the last 5 minutes to get the top a little crispy again.
This crisp doesn't freeze well. The filling gets watery when thawed and the streusel loses its texture, so I'd skip it.
To make ahead: prepare the filling and streusel separately up to 24 hours in advance, store them covered in the refrigerator, and assemble and bake the day you plan to serve it. That's the move.
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Recipe
Apple Rhubarb Crisp
Equipment
Ingredients
Filling
- ½ cup sugar (see notes)
- 3 tablespoons corn starch
- 4 cups sliced fresh rhubarb (or frozen-see notes)
- 2 cups apples, peeled and cut into 1-inch chunks about 2 medium apples, Honeycrisp or Granny Smith recommended
Streusel Topping
- 1 cup old-fashioned rolled oats
- ½ cup packed brown sugar
- ½ cup all-purpose flour
- ½ teaspoon salt
- 1 teaspoon ground cinnamon
- ½ cup butter (melted)
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Instructions
- Preheat oven to 350°F. Grease an 8x8 or 7x11 baking dish and set aside.
- In a large bowl, whisk together the granulated sugar and corn starch. Add rhubarb and apples and toss until everything is evenly coated. Spread in the prepared baking dish.½ cup sugar, 3 tablespoons corn starch, 4 cups sliced fresh rhubarb, 2 cups apples, peeled and cut into 1-inch chunks
- In a medium bowl stir together the oats, brown sugar, flour, salt and cinnamon. Pour in the melted butter and stir until combines and the mixture looks like coarse, clumpy crumbs. S1 cup old-fashioned rolled oats, ½ cup packed brown sugar, ½ cup all-purpose flour, ½ teaspoon salt, 1 teaspoon ground cinnamon, ½ cup butter
- Sprinkle the streusel evenly over the fruit.
- Bake for 50 minutes, until the streusel is deep golden brown and the fruit juices are actively bubbling up around the edges. If streusel brwons before the filling bubbles, tent loosely with foil and continue baking.
- Remove from the oven and rest for 15 -20 minutes before serving. The filling will thicken as it cools. Serve warm with vanilla or cinnamon ice ream.
Notes
- Best apples: Honeycrisp, Granny Smith, or Braeburn. Avoid soft varieties that cook down to applesauce.
- Frozen rhubarb: Thaw completely and drain in a colander for at least 10 minutes. If the rhubarb still seems very wet, add 1 extra tablespoon of cornstarch to the filling.
- Sugar adjustment: For a more tart filling, reduce to ⅓ cup granulated sugar. For a sweeter crisp, increase to ¾ cup.
- Gluten-free: Use certified GF old-fashioned oats and a 1:1 GF flour blend. Texture will be very similar to the original.
- Double the streusel: For a thicker topping layer, double all streusel ingredients. Same bake time.
- Storage: Refrigerate covered for up to 4 days. Reheat at 325°F for 10-15 minutes loosely covered with foil, then uncover for the last 5 minutes to re-crisp.
- Make ahead: Prepare the filling and streusel separately up to 24 hours ahead, store covered in the refrigerator, and assemble just before baking. You can also bake it earlier in the day and cool to room temperature. Reheat at 350 for 15 minutes if you want to serve it warm or serve at room temperature.
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Nutrition
Nutrition info not guaranteed to be accurate.
Linda says
I only had 3 cups of rhubarb so I added an extra cup of apples I
instead.I used a crumble crust instead of the crisp topping..I
never thought of using apples and rhubarb together.So glad you
shared this recipe!
Chris says
This was excellent…I made it according to the recipe. It was just the right balance between sweet and tart. Easy and baking time was spot on! Thank you!
S.Fox says
I love the way you put the recipe under the instructions. You made cooking from a handheld device so easy.
So happy it is helpful! Cheers!
Trossi says
Agreed!
Patricia Pacaud says
Absolutely delicious and an easy recipe.
Chio says
I made it today for the first time, and my family loved it! I served it with vanilla ice cream on the side. Absolutely delicious! Thanks for the recipe.