Sugar-Free Strawberry Rhubarb Crisp
Finding the ideal balance between tart rhubarb and sweet strawberries used to be a challenge in my kitchen, especially when skipping refined sugar. After testing a few batches, I found that tossing the fruit with a splash of fresh orange juice and a touch of stevia brings out the natural sweetness without turning the filling watery. The real secret lies in the topping: adding almond flour and melted butter gives you that buttery, golden crumble without relying on standard white flour.
Recipe Highlights
- Naturally Sweetened: Completely free from refined sugars and sweetened naturally.
- Crispy Topping: Features a crisp, buttery topping made with oats and almond flour.
- Perfect Filling: Balanced sweet-tart fruit filling that does not get overly runny.
- Simple Prep: Simple prep work using everyday baking staples.
- Customizable Flavor: Easy to customize with warm spices like cinnamon or nutmeg.
Key Ingredients Breakdown
Fresh Rhubarb
Rhubarb provides the signature sharp, tangy base for this dessert. Because it can be quite tart on its own, cutting the stalks into small, even pieces helps them soften quickly and blend smoothly with the sweet berries. If fresh rhubarb is out of season, unsweetened frozen sliced rhubarb works well; just thaw and drain off excess liquid first.
Fresh Strawberries
Strawberries offer natural sweet juices and vibrant color that offset the sour bite of the rhubarb. Using ripe, sweet berries reduces the need for extra zero-calorie sweetener. Frozen strawberries can be substituted, but avoid thaw-and-drain steps so you do not lose the juicy fruit liquid needed for the filling.
Granulated Monk Fruit or Erythritol Sweetener
This sweetener replaces traditional white sugar in both the filling and the topping. It dissolves smoothly into the fruit mixture while baking and allows the oats in the crust to brown nicely. Swapping in liquid stevia or allulose also works, though allulose will brown a bit faster in the oven.
Rolled Oats
Rolled oats build the core structure of the crumble topping, providing a hearty, chewy contrast to the soft baked fruit. Old-fashioned oats give the best bite. For a strict gluten-free version, use certified gluten-free rolled oats, or swap them for coconut flakes if you prefer an oat-free option.
Almond Flour
Almonds add a rich, nutty depth and hold the butter and oats together into crumbly clusters. Super-fine blanched almond flour works best for a delicate tender crumb, but almond meal can be used for extra texture.
Unsalted Butter
Melted unsalted butter coats the oat mixture, helping it turn golden brown and rich in the oven. If you prefer a dairy-free dessert, melted coconut oil or a quality vegan butter block makes a direct substitute.
Why You Will Love This Sugar-Free Strawberry Rhubarb Crisp
A classic, vibrant fruit dessert with a warm buttery crunch—completely free of refined sugar.
Perfect Sweet-Tart Balance
The natural tartness of fresh rhubarb cuts through the sweetness of ripe strawberries, creating a vibrant fruit base without needing cups of refined sugar.
Warm, Buttery Crunch
The toasted oat and almond flour crumble delivers that classic, satisfying crisp texture in every single bite.
Naturally Lightened Up
Sweetened with monk fruit or erythritol, this dessert keeps the carbohydrates low and completely eliminates added sugars while keeping full flavor.
Simple Prep Work
Made with straightforward baking staples, you can toss the fruit, mix the topping, and have it bubbling in the oven in just 15 minutes.
Comforting & Versatile
It satisfies traditional dessert cravings on its own, but pairs just as amazingly with a scoop of sugar-free vanilla ice cream or a dollop of Greek yogurt.
Pro Tips
- Slice the rhubarb thin so it cooks at the exact same rate as the strawberries.
- Let the baked crisp rest for at least 10 minutes before serving so the fruit juices thicken properly.
- Bake on the center rack of your oven to ensure the oat topping browns evenly without burning.
Storage & Reheating
- Refrigeration: Store cooled leftovers in an airtight container in the refrigerator for up to 4 days.
- Freezing: You can freeze the baked crisp for up to 3 months. Wrap the baking dish tightly in plastic wrap and aluminum foil before placing it in the freezer. Thaw overnight in the fridge before reheating.
- Reheating: To maintain the crunchy topping, warm leftovers in the oven at 325°F (160°C) for 10 to 12 minutes. For a quick option, microwave individual portions for 30 to 45 seconds, though the topping will be softer.
Sugar-Free Strawberry Rhubarb Crisp
Course: DessertCuisine: AmericanDifficulty: Easy6
servings15
minutes40
minutes1170
kcalThis Sugar-Free Strawberry Rhubarb Crisp combines jammy, warm fruit with a toasted oat and nut topping. It strikes a balanced blend of tart and sweet flavors while maintaining a classic crunchy crisp texture. It is a lightened-up dessert that delivers all the comfort of a traditional fruit bake without any added sugar.
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Ingredients
- Fruit Filling:
​3 cups fresh rhubarb, diced into 1/2-inch pieces
​3 cups fresh strawberries, hulled and sliced
​1/3 cup granulated monk fruit sweetener
​1 tablespoon tapioca starch or cornstarch
​1 tablespoon fresh lemon juice
​1 teaspoon vanilla extract
- ​Crumble Topping:
​1 cup old-fashioned rolled oats
​1/2 cup almond flour
​1/3 cup granulated monk fruit sweetener
​1/2 teaspoon ground cinnamon
​1/4 teaspoon salt
​1/4 cup unsalted butter, melted
Directions
- Preheat your oven to 350°F (175°C). Lightly grease an 8×8-inch baking dish with butter or non-stick cooking spray and set it aside.
- In a large mixing bowl, combine the diced rhubarb, sliced strawberries, monk fruit sweetener, tapioca starch, lemon juice, and vanilla extract. Toss the ingredients gently until the starch and sweetener evenly coat the fruit. Transfer the fruit mixture into the prepared baking dish, spreading it out into an even layer.
- In a separate medium bowl, stir together the rolled oats, almond flour, monk fruit sweetener, ground cinnamon, and salt. Pour the melted butter over the dry ingredients and stir with a fork until moist, clumpy crumbs form throughout the bowl.
- Evenly scatter the oat crumble topping over the fruit layer in the baking dish, covering as much of the fruit as possible. Bake uncovered for 35 to 40 minutes, or until the fruit filling is bubbling around the edges and the oat topping turns golden brown.
- Remove the dish from the oven and set it on a wire cooling rack. Allow the crisp to cool for 10 to 15 minutes before serving so the warm juices settle. Serve warm on its own or with a scoop of sugar-free vanilla ice cream.
Notes
- Equipment Needed: An 8×8-inch baking dish, cutting board, sharp chef’s knife, mixing bowls, and a rubber spatula.
- Preventing Watery Filling: If your fruit is particularly juicy, add an extra half-teaspoon of tapioca starch to help setting.
- Nut-Free Option: Swap the almond flour for sunflower seed meal or extra oats to keep the recipe completely nut-free.
Nutrition Facts & Label
Servings: 6 | Amount Per Serving: | ​Calories: 195 | ​Total Fat: 11g | ​Saturated Fat: 5g | ​Cholesterol: 20mg | ​Sodium: 105mg | ​Total Carbohydrate: 22g | ​Dietary Fiber: 5g | ​Sugars: 6g | ​Protein: 4g
Frequently Asked Questions
Can I use frozen fruit instead of fresh? Yes, frozen fruit works fine in this recipe. Mix the frozen strawberries and rhubarb directly with the filling ingredients without thawing them first, but add 5 extra minutes to the total baking time.
How do I keep the oat topping crunchy when storing? Avoid covering the dish with plastic wrap while it is still warm, as trapped steam will make the topping soft. Once fully cooled, store it covered in the fridge and reheat it in an oven or toaster oven rather than the microwave.
