Soft rhubarb bars with a delightful oatmeal crumb topping are the perfect treat for any occasion. These Amish Oatmeal Rhubarb Bars (with crumb topping) combine a sweet-tangy filling of cooked rhubarb with a crunchy base that’s simply irresistible. Whether you’re hosting a gathering or treating yourself to a cozy dessert, these bars offer a unique flavor and texture that will surely impress.
Why You’ll Love This Recipe
- Easy to Make: With simple ingredients and straightforward steps, this recipe is perfect for bakers of all levels.
- Delicious Flavor: The balance of sweetness and tartness from the rhubarb creates an unforgettable taste experience.
- Perfect for Any Occasion: These bars are great for picnics, potlucks, or as a comforting dessert at home.
- Versatile Serving Options: Enjoy them warm with ice cream or at room temperature as an afternoon snack.
- Make Ahead Friendly: These bars keep well in the fridge, making them ideal for meal prep or last-minute gatherings.
Tools and Preparation
To make your baking process smooth, having the right tools on hand is essential. Here’s what you’ll need.
Essential Tools and Equipment
- Mixing bowl
- 2-quart saucepan
- Baking dish (8×8 inches)
- Parchment paper (optional)
- Spoon or spatula
Importance of Each Tool
- Mixing bowl: A sturdy mixing bowl is vital for combining your ingredients without spilling.
- 2-quart saucepan: This size is perfect for cooking the rhubarb filling evenly.
- Baking dish (8×8 inches): Using the right size ensures proper cooking and even texture in your bars.
Ingredients
For the Crumb Topping/Base
- 1 cup old fashioned rolled oats
- 3/4 cup all-purpose flour
- 1/2 cup butter, softened
- 1/8 teaspoon salt
- 1/8 teaspoon baking soda
- 1/2 cup brown sugar, packed
For the Rhubarb Filling
- 1 1/2 cups chopped rhubarb
- 3/4 cup granulated sugar
- 1 tablespoon cornstarch, heaping
- 2 tablespoons water
- 1/2 teaspoon vanilla extract
How to Make Amish Oatmeal Rhubarb Bars (with crumb topping)
Step 1: Preheat the Oven
Preheat your oven to 350°F. This ensures that your bars bake evenly and become perfectly golden.
Step 2: Prepare the Crumb Base
In a medium mixing bowl:
1. Combine oats, flour, butter, salt, baking soda, and brown sugar.
2. Mix until coarse crumbs form. Set aside about 2/3 cup of this mixture for topping later.
Step 3: Cook the Rhubarb Filling
In a 2-quart saucepan:
1. Combine chopped rhubarb, granulated sugar, cornstarch, and water.
2. Simmer over medium-high heat for 5-10 minutes. Stir frequently until the rhubarb softens and the mixture turns clear.
3. Remove from heat and stir in vanilla extract. Allow it to cool for about 10 minutes until slightly thickened.
Step 4: Assemble the Bars
In a greased or parchment-lined 8×8-inch baking dish:
1. Press all but 2/3 cup of oatmeal crumbs into the bottom firmly to prevent cracks.
2. Pour the warm rhubarb filling over this crumb base.
3. Evenly sprinkle the reserved crumbs over the top.
Step 5: Bake
Bake in your preheated oven for 30-40 minutes. Look for a golden bottom with set filling and topping.
Step 6: Cool and Serve
Allow bars to cool completely before cutting them into squares. Enjoy these delicious Amish Oatmeal Rhubarb Bars with crumb topping!
How to Serve Amish Oatmeal Rhubarb Bars (with crumb topping)
Amish Oatmeal Rhubarb Bars (with crumb topping) are a delightful dessert that can be enjoyed in various ways. Whether you’re hosting a gathering or just treating yourself, these bars can be served with a variety of accompaniments.
With Ice Cream
- Vanilla Ice Cream: The creamy texture complements the sweet-tangy filling perfectly.
- Cinnamon Ice Cream: Adds a warm spice that enhances the flavors of the rhubarb.
As Breakfast Bars
- Morning Snack: Enjoy a bar with your morning coffee or tea.
- On-the-go Option: Wrap them up for a quick breakfast when you’re in a hurry.
With Fresh Fruit
- Sliced Strawberries: Brightens the dish and adds freshness.
- Blueberries or Raspberries: Their tartness pairs well with the sweetness of the bars.
With Whipped Cream
- Lightly Sweetened Whipped Cream: A dollop on top adds an airy texture and extra sweetness.
- Flavored Whipped Cream: Consider vanilla or almond extract for added flavor depth.
As Part of a Dessert Platter
- Pair with Other Desserts: Include cookies, brownies, and fresh fruit for a delightful spread.
- Add Some Nuts: Almonds or pecans can provide a crunchy contrast to the soft bars.

How to Perfect Amish Oatmeal Rhubarb Bars (with crumb topping)
Perfecting your Amish Oatmeal Rhubarb Bars (with crumb topping) can elevate your baking game. Here are some tips to ensure they turn out delicious every time.
- Use Fresh Rhubarb: Fresh rhubarb provides the best flavor and texture. If using frozen, make sure to thaw and drain excess moisture.
- Adjust Sweetness: Depending on your taste or the tartness of the rhubarb, feel free to adjust sugar levels in both the filling and crumb topping.
- Don’t Overmix: When combining ingredients for the crumb mixture, mix just until combined for better texture.
- Cool Completely: Allow the bars to cool fully before cutting; this helps them hold their shape better when serving.
- Experiment with Spices: Adding cinnamon or nutmeg can enhance the flavor profile of both the filling and topping.
- Store Properly: Keep leftover bars in an airtight container at room temperature for up to three days, or refrigerate for longer freshness.
Best Side Dishes for Amish Oatmeal Rhubarb Bars (with crumb topping)
Serving side dishes alongside your Amish Oatmeal Rhubarb Bars (with crumb topping) can create a well-rounded dessert experience. Consider these tasty options:
- Vanilla Yogurt: Creamy and smooth, it pairs well with the tartness of rhubarb while adding protein.
- Fruit Salad: A medley of seasonal fruits can balance out the richness of the bars nicely.
- Cheese Platter: Include mild cheeses like cream cheese or brie for a savory contrast to your sweet dessert.
- Coffee Cake: A slice alongside your bars creates an inviting brunch spread perfect for gatherings.
- Chai Tea: The aromatic spices in chai tea complement rhubarb’s unique flavors beautifully.
- Pecan Pie Bites: These add another layer of sweetness and crunch that guests will enjoy.
- Chocolate-Covered Strawberries: For those who love chocolate, these treats add elegance and decadence to your dessert table.
- Lemon Sorbet: The refreshing citrus flavor cuts through sweetness and cleanses the palate after rich bites.
Common Mistakes to Avoid
When making Amish Oatmeal Rhubarb Bars (with crumb topping), it’s easy to make a few common mistakes that can affect the final product. Here are some pitfalls to watch out for:
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Overmixing the Crumb Mixture – If you mix the crumb topping too much, it can become tough. Mix just until coarse crumbs form for a light, tender texture.
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Skipping Cooling Time for Filling – Pouring the rhubarb filling while it’s too hot can lead to soggy bars. Allow it to cool slightly and thicken before adding it to the crust.
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Not Pressing the Crust Firmly Enough – A loose crumb base can crack during baking. Make sure to press down firmly to create a solid foundation for your bars.
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Underbaking or Overbaking – Keeping an eye on your bars as they bake is crucial. Baking them too long can dry them out, while underbaking may leave them soggy. Aim for a golden bottom and set filling.
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Using Fresh vs. Frozen Rhubarb Incorrectly – Fresh rhubarb typically cooks down more quickly than frozen. Adjust cooking times accordingly if you’re using frozen rhubarb.
Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container.
- They will last up to 5 days in the fridge.
- Place parchment paper between layers if stacking to prevent sticking.
Freezing Amish Oatmeal Rhubarb Bars (with crumb topping)
- Wrap tightly in plastic wrap and then in aluminum foil.
- They can be frozen for up to 3 months.
- Thaw overnight in the refrigerator before serving.
Reheating Amish Oatmeal Rhubarb Bars (with crumb topping)
- Oven – Preheat your oven to 350°F and reheat bars for about 10-15 minutes until warm.
- Microwave – Heat individual bars on high for 20-30 seconds until warmed through.
- Stovetop – Place bars in a pan over low heat, covered with a lid, and warm gently for about 5 minutes.
Frequently Asked Questions
Can I use other fruits instead of rhubarb?
You can replace rhubarb with fruits like strawberries or cherries for a different flavor profile. Just adjust sugar levels accordingly based on fruit sweetness.
How do I know when the bars are done baking?
The bars should be golden brown on the bottom, and both the filling and topping should be set. A toothpick inserted should come out clean or with only a few moist crumbs.
What if I don’t have brown sugar?
If brown sugar is unavailable, you can use granulated sugar with a teaspoon of molasses mixed in per cup for similar flavor and moisture.
How can I customize my Amish Oatmeal Rhubarb Bars (with crumb topping)?
Consider adding nuts, spices like cinnamon, or even coconut flakes into the crumb mixture for added texture and flavor.
Final Thoughts
These Amish Oatmeal Rhubarb Bars (with crumb topping) are not only delicious but also versatile! Their sweet-tangy filling combined with a hearty oatmeal crust makes them perfect for any occasion. Feel free to experiment with different fruits or toppings that suit your taste buds; you’ll surely find endless ways to enjoy this delightful treat!
Amish Oatmeal Rhubarb Bars (with crumb topping)
- Total Time: 50 minutes
- Yield: Approximately 9 servings 1x
Description
Experience the delightful taste of Amish Oatmeal Rhubarb Bars, featuring a sweet-tangy rhubarb filling nestled between a crunchy oatmeal crumb base. These bars are perfect for any occasion, whether you’re hosting a potluck, enjoying a cozy dessert at home, or seeking a delicious treat to share. With simple ingredients and easy-to-follow steps, bakers of all levels will find joy in creating these irresistible bars. Serve them warm with ice cream, enjoy them as a breakfast option, or pair them with fresh fruits for an added burst of flavor. Satisfy your sweet tooth with this unique dessert that’s as enjoyable to make as it is to eat.
Ingredients
- 1 cup old fashioned rolled oats
- 3/4 cup all-purpose flour
- 1/2 cup butter (softened)
- 1 1/2 cups chopped rhubarb
- 3/4 cup granulated sugar
- 1 tablespoon cornstarch
- 1/2 teaspoon vanilla extract
- 1/8 teaspoon salt
- 1/8 teaspoon baking soda
- 1/2 cup brown sugar (packed)
- 2 tablespoons water
Instructions
- Preheat oven to 350°F.
- In a mixing bowl, combine oats, flour, butter, salt, baking soda, and brown sugar until coarse crumbs form. Set aside 2/3 cup for topping.
- In a saucepan over medium-high heat, simmer chopped rhubarb with granulated sugar, cornstarch, and water for about 5-10 minutes until softened. Stir in vanilla and cool slightly.
- Press the remaining crumb mixture into an 8×8-inch greased or parchment-lined baking dish.
- Pour the warm rhubarb filling over the crust and sprinkle reserved crumbs on top.
- Bake for 30-40 minutes until golden brown; cool completely before cutting.
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 serving
- Calories: 210
- Sugar: 12g
- Sodium: 80mg
- Fat: 10g
- Saturated Fat: 6g
- Unsaturated Fat: 3g
- Trans Fat: 0g
- Carbohydrates: 28g
- Fiber: 2g
- Protein: 3g
- Cholesterol: 20mg





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