Delicious Amish Oatmeal Rhubarb Bars

WANT TO SAVE THIS RECIPE?

Sweet, tart, buttery, and packed with old-fashioned comfort, these Delicious Amish Oatmeal Rhubarb Bars are the kind of treat that feels like something passed down through generations. The soft rhubarb filling bakes into a jammy layer that contrasts beautifully with the crumbly oatmeal crust and topping, giving every bite a balance of texture and flavor.

If you love rustic desserts that are easy to make and even easier to share, this is one of those dependable bakes you will want to keep in your recipe box. These bars are perfect for spring gatherings, summer potlucks, afternoon coffee breaks, or anytime you want a dessert that tastes homemade in the best possible way.

---

Why Are Amish Oatmeal Rhubarb Bars So Irresistible?

What makes these bars stand out is the contrast between the bright rhubarb layer and the rich oat crumble. Rhubarb brings a natural tartness that keeps the bars from tasting too sweet, while the buttery oat mixture adds warmth, chew, and a lightly crisp finish. It is a simple combination, but it creates a dessert that feels both nostalgic and special.

---

Ingredients for the Delicious Amish Oatmeal Rhubarb Bars

Each ingredient in these Delicious Amish Oatmeal Rhubarb Bars plays an important role in building the bars from the bottom up. Together, they create a sturdy crust, a juicy fruit layer, and a golden crumb topping that holds everything together.

• Old-fashioned oats: These give the bars their signature hearty texture and rustic crumble.
• All-purpose flour: Flour helps bind the crust and topping so the bars slice neatly.
• Brown sugar: This adds sweetness and a warm caramel-like flavor that pairs beautifully with tart rhubarb.
• Baking soda: A small amount helps lighten the oat mixture and keeps it from becoming too dense.
• Salt: Salt sharpens the flavor of both the crumble and the filling.
• Ground cinnamon: Cinnamon adds gentle warmth and makes the bars feel extra cozy.
• Unsalted butter: Melted or softened butter brings richness and helps the oat mixture form a crumbly crust.
• Fresh rhubarb: This is the star ingredient, adding bright color and a tart, juicy filling.
• Granulated sugar: Sugar sweetens the rhubarb enough to balance its natural sharpness.
• Cornstarch: This thickens the rhubarb filling so it becomes soft and spoonable instead of watery.
• Vanilla extract: Vanilla rounds out the fruit flavor and adds a soft bakery-style aroma.
• Lemon juice: A little lemon brightens the filling and enhances the rhubarb without overpowering it.

---

How To Make the Delicious Amish Oatmeal Rhubarb Bars

These Delicious Amish Oatmeal Rhubarb Bars come together in simple layers, making them a great dessert for beginner bakers and anyone who loves an easy homemade treat. Once the crust is pressed in, the filling is spread over the top, and the remaining crumble is scattered on, the oven does the rest.

Step 1: Prepare the Pan

Preheat your oven to 350°F and line a 9×13-inch baking pan with parchment paper or lightly grease it. This helps the bars lift out more easily after baking and keeps cleanup simple.

Step 2: Make the Oat Crumble Mixture

In a large mixing bowl, combine the oats, flour, brown sugar, baking soda, salt, and cinnamon. Stir in the butter until the mixture becomes evenly moistened and crumbly.

Step 3: Form the Bottom Crust

Press about two-thirds of the oat mixture firmly into the prepared pan. This creates the sturdy base that will hold the soft rhubarb filling.

Step 4: Mix the Rhubarb Filling

In another bowl, toss the chopped rhubarb with granulated sugar, cornstarch, vanilla extract, and lemon juice. Stir until the rhubarb is evenly coated and the mixture begins to look glossy.

Step 5: Layer the Filling

Spread the rhubarb mixture evenly over the crust, making sure the fruit reaches the corners of the pan so every bar gets a balanced bite.

Step 6: Add the Crumble Topping

Sprinkle the remaining oat mixture over the rhubarb layer. Do not pack it down too tightly, because a loose topping bakes up with better texture.

Step 7: Bake Until Golden

Bake for 40 to 45 minutes, or until the top is lightly golden and the filling is bubbling around the edges. The center will continue to set as it cools.

Step 8: Cool and Slice

Let the bars cool completely in the pan before slicing. This gives the filling time to firm up and helps you get cleaner squares.

---

Serving and Storing Delicious Amish Oatmeal Rhubarb Bars

These bars are wonderful served slightly chilled, at room temperature, or gently warmed. For a simple finish, dust them with powdered sugar or serve them with a scoop of vanilla ice cream or a dollop of whipped cream. Their sweet-tart flavor also pairs nicely with coffee, tea, or a cold glass of milk.

To store them, place the cooled bars in an airtight container in the refrigerator for up to 5 days. You can also freeze them in layers separated by parchment paper for longer storage. Thaw in the refrigerator overnight before serving.

Frequently Asked Questions

Can I use frozen rhubarb?

Yes, frozen rhubarb works well. Thaw it first and drain off excess liquid so the filling does not become too wet.

Do I have to peel rhubarb?

No, rhubarb usually does not need peeling. Just trim the ends and slice the stalks into small pieces.

Can I make these bars ahead of time?

Yes, these bars are a great make-ahead dessert. In fact, they slice even better after they have had time to cool fully and chill.

Can I add strawberries to the filling?

Yes, strawberries pair beautifully with rhubarb. You can swap in a small portion of chopped strawberries for part of the rhubarb if you want a sweeter filling.

Why are my bars falling apart?

They may have been sliced before fully cooling. Letting them cool completely helps the filling set and the crust hold together.

Can I use quick oats instead of old-fashioned oats?

You can, but the texture will be softer and less hearty. Old-fashioned oats give the bars their best crumbly structure.

---

Want More Dessert Ideas?

If you love these Delicious Amish Oatmeal Rhubarb Bars, you will probably enjoy these other sweet treats from Life with Nina:

• Lemon Oatmeal No-Bake Cookies for another easy oatmeal dessert with bright flavor.
• Soft and Chewy Oatmeal Chocolate Chip Cookies if you want a classic oat-based favorite.
• Cake Mix Toffee Bars for another simple bar dessert that is perfect for sharing.
• Hot Fudge Pie when you are craving something rich, warm, and deeply chocolatey.
• Healthy Banana Oatmeal Muffins for a cozy baked option with wholesome appeal.

---

Save This Pin + Share Your Results

📌 Save these Delicious Amish Oatmeal Rhubarb Bars to your Pinterest dessert board so you can come back to them any time.

And let me know in the comments how yours turned out. Did you keep them classic and tart, or did you add strawberries for a sweeter twist?

I love hearing how others make these recipes their own. Questions are welcome too, and for even more homemade dessert inspiration, visit Life with Nina on Pinterest.

---

Print