Easy Rhubarb Bars
Easy rhubarb bars are one of the simplest and most delicious ways to enjoy rhubarb season. From the moment the sweet-tart aroma fills the kitchen, you know something special is baking.
These bright and simple bars feature a tangy rhubarb filling nestled between two soft, chewy layers of oat and honey goodness. Perfect served warm with ice cream or chilled as a quick snack, they’re an easy dessert you’ll want to make again and again.
Whether you’re baking for family, friends, or just yourself, this recipe brings comfort, color, and flavor to your table without any fuss.
Why You’ll Love These Easy Rhubarb Bars
Let me break down why I think these rhubarb bars will quickly become a favorite in your kitchen:
- Simply made with just 7 easy-to-find ingredients. Aside from the rhubarb, you’ll only need oats, almond flour, brown sugar, honey, butter, and a touch of ground ginger.
- Ready in a flash. You’ll spend less than 15 minutes prepping, then pop them in the oven for a quick 30-minute bake. The same oat mixture works for both the base and the top, making it straightforward and kid-friendly—and a similar crumbly oat layer stars in our Easy Strawberry Oatmeal Crumble Bars.
- A healthier sweet treat. Mostly natural ingredients mean you can indulge in these bars guilt-free while still feeling like you’re treating your family well.
- Deliciously balanced! Crunchy on top, chewy underneath, and bursting with tangy rhubarb in the middle—that zingy sweet-tart combo is hard to resist. If that flavor is your thing, you’ll also love our Rhubarb Cherry Hibiscus Crumble.
- Perfect anytime. Whether as a snack on the go or warmed up with a scoop of ice cream for dessert, these bars hit the spot.
Ingredients for Easy Rhubarb Bars
- 4 rhubarb stalks, leaves and tough parts removed, chopped into 1-cm pieces
- 2 tablespoons brown sugar
- 3 tablespoons butter, (about 1.5 ounces or 3 tbsp)
- ¼ cup brown sugar
- 3½ tablespoons honey, any kind, melted with butter and sugar
- 2½ cups rolled oats, stick to rolled oats, not quick or instant
- 1 cup almond flour, (sometimes called almond meal)
- 1 teaspoon ground ginger, (feel free to add chopped candied ginger for more zing)
How to Make Easy Rhubarb Bars
- Preheat oven to 190°C (375°F) for fan ovens or 200°C (390°F) for conventional ovens and line an 8 x 8 inch (20 x 20 cm) cake pan with baking paper.
- Trim leaves and tough parts from 4 rhubarb stalks and chop into 1-cm pieces.
- In a saucepan combine chopped rhubarb, 2 tablespoons brown sugar, and 1 tablespoon water; cook over medium heat, stirring occasionally, about 10 minutes, until softened but holding shape; set aside to cool slightly.
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In another large pan melt 3 tablespoons butter, 1/4 cup brown sugar, and 3½ tablespoons honey together, stirring until smooth; remove from heat.
- Stir rolled oats, 1 cup almond flour, and 1 teaspoon ground ginger into the melted mixture until the oats are fully coated and the mixture is combined.
- Press two-thirds of the oat mixture firmly into the lined pan to form the base.
- Evenly spread the cooled cooked rhubarb over the oat base.
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Sprinkle the remaining oat mixture over the rhubarb to form the top layer.
- Bake 20–25 minutes until the oat topping is a warm golden brown, tenting loosely with foil during the last 5–10 minutes if it browns too quickly.
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Let the bars cool completely in the pan before slicing.
Pro Tips for Best Results
Rhubarb is known for its naturally tart flavor, making it perfect for desserts like these easy rhubarb bars.
- When you sprinkle the final third of the oat mixture on top, some bits of ruby-red rhubarb might peek through. That’s exactly what you want! It adds a gorgeous pop of color and a little extra burst of fruity flavor.
- If your bars brown too fast on top, tent the pan loosely with foil for the last 5 to 10 minutes. This keeps them from burning while finishing baking through.
- Rhubarb freezes beautifully, so consider cooking up extra rhubarb compote while it’s in season. When you’re ready to bake, just defrost about 1¼ cups of the rhubarb filling to make one batch of bars.
- Not rhubarb season? No worries! Swap in fresh berries or stone fruits like nectarines, peaches, or plums—no cooking needed for those fruits in this recipe.
- Strawberries and rhubarb make a classic duo, so don’t hesitate to throw a handful of sliced strawberries into the rhubarb mix. A splash of vanilla is also a nice touch.
Biting into one of these bars brings the best textures: a crumbly, oatty top layer, tangy rhubarb filling that brightens your palate, then a slightly chewy oat base to hold it all together.
Here’s how I love to enjoy them:
- Warm with a scoop of ice cream or dairy-free “nice cream” on top for a cozy dessert
- Like a fruit crisp, served with cream, Greek yogurt, or custard
- Chilled, as a portable snack for school lunchboxes, picnics, or afternoon treats
Easy Swaps and Add-Ins
Want to mix things up or cater to your family’s dietary needs? Try these easy swaps and extras:
- Fruit swaps: Stir in sliced strawberries with rhubarb or replace it altogether with berries, peaches, nectarines, or plums. Remember, berries and stone fruits don’t need cooking first.
- Sweetener swaps: Switch maple syrup for honey, or cut back the brown sugar if you like your filling tangier.
- Flour swaps: Use regular all-purpose or whole wheat flour instead of almond flour if you’re avoiding nuts.
- Dairy-free option: Swap butter for solid coconut oil in the same amount.
- Flavor boosts: Add 1–2 teaspoons vanilla; a sprinkle of cinnamon or allspice (see how warmly it pairs with rhubarb in Cinnamon Rhubarb Bread); or fold in some chopped candied/preserved ginger for a spicy kick. Prefer a brighter twist? A little lemon zest works beautifully too, as in this Lemon Rhubarb Loaf.
- Texture add-ins: Toss in chopped walnuts, pecans, seeds, or shredded coconut for extra crunch. You can also sprinkle seeds on top before baking for a pretty finish.
- Keep it gluten-free: Use oats labelled gluten-free and retain the almond flour (or choose a certified gluten-free flour blend).
How to Store Easy Rhubarb Bars
Cooling and storing short term:
- Let the pan cool completely, or pop it in the fridge to chill. Cold bars hold together better and slice neater.
- Keep cooled bars in an airtight container in the fridge for up to 3 days. They’ll soften a bit on top but stay tasty.
Freezing and prepping ahead:
- Freeze individual slices in a single layer on a baking sheet first. Then transfer to a freezer bag or airtight container. This way, you can grab a bar whenever the snack attack hits, no thawing needed.
- Make extra rhubarb filling ahead of time and freeze it; just defrost about 1¼ cups per pan when you’re ready to bake. If you have a bumper crop of rhubarb, consider preserving the surplus as rhubarb juice concentrate (with canning instructions).
Reheating tips:
- From chilled: Warm at 180°C (350°F) for 8–12 minutes to heat through and get the top crisp again.
- From frozen: Bake at 180°C (350°F) for 15–20 minutes without thawing until hot and lightly crisp.
- Microwave for a quick warm-up, but keep in mind the oat top will soften instead of stay crunchy.
Common Questions About Easy Rhubarb Bars
The bars are really crumbly. What did I do wrong?
No worries, that’s totally normal! These bars have a crumble-like texture when warm, almost like eating a crisp or fruit crumble. You can enjoy them warm with a spoon, or for neater slices, let them cool completely or chill before cutting. I love them both ways!
Are these rhubarb bars gluten free?
They can be! Just be sure to use oats that are labeled gluten free. When you do that, these bars are a fantastic gluten-free dessert option.
How long can I store them for?
Keep the bars in an airtight container in the fridge for up to a few days. They’ll lose some crispness on top after the first day but will stay tasty. For longer storage, freeze them in bags or containers for up to 3 months. Reheat straight from frozen in a 350°F (180°C) oven for 15–20 minutes until warmed through and the top crisps up again.
If you love the combo of fruit and oats, give these easy apple and oat muffins a try. And if you’re up for a little more time in the kitchen, this simple apple crumble pie with oats is a total winner too! Prefer something citrusy? Try Strawberry Lemon Cake for a bright, fruit-forward bake.
🧡 Conclusion
There’s something truly special about baking these easy rhubarb bars from scratch. From the sweet-tart aroma filling the kitchen to that first bite of soft, chewy oats and tangy rhubarb, it’s the kind of simple homemade treat that brings everyone back for more.
Whether you serve them warm with a scoop of ice cream or enjoy them chilled as a quick snack, these easy rhubarb bars are a beautiful way to celebrate the season with minimal effort and maximum flavor. I love how versatile they are—you can keep them classic or make them your own with little twists along the way.
If you give this recipe a try, I’d love to hear how it turned out for you. Did you add strawberries or keep it simple? Either way, this is one of those recipes that quickly becomes a cozy favorite in any kitchen.
Happy baking 🤍
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Easy Rhubarb Bars
- Total Time: 45 minutes
- Diet: Vegetarian
Description
These easy rhubarb bars are sweet, tangy, and made with a soft oat crumble. A simple dessert perfect for spring and rhubarb season.
Ingredients
FOR THE RHUBARB
2 tablespoons brown sugar
1 tablespoon water
1/4 cup brown sugar
3½ tablespoons honey
2½ cups rolled oats
1 cup almond flour
1 teaspoon ground ginger
TO SERVE (OPTIONAL)
Instructions
1. Preheat oven to 190°C (375°F) and line an 8×8 inch pan with parchment paper.
2. In a saucepan, cook rhubarb with brown sugar and water for about 10 minutes until softened. Let cool.
3. In another pan, melt butter, brown sugar, and honey together.
4. Stir in oats, almond flour, and ginger until combined.
5. Press two-thirds of the mixture into the pan.
6. Spread rhubarb filling evenly on top.
7. Sprinkle remaining oat mixture over.
8. Bake for 20–25 minutes until golden brown.
9. Let cool completely before slicing.
Notes
Let the bars cool completely for cleaner slices.
You can substitute rhubarb with strawberries or berries.
Store in the fridge for up to 3 days or freeze for longer storage.
- Prep Time: 10 minutes
- Cook Time: 35 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 8 large or 16 small bars
- Calories: 284 kcal
- Fat: 13g
- Carbohydrates: 39g
- Protein: 7g
