Rhubarb Oatmeal Bars

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Slightly chewy and sweetly tart, these Rhubarb Oatmeal Bars combine a crunchy oat topping with flavorful rhubarb for a dessert the whole family will love.

Rhubarb bars with crunchy oatmeal topping, served on a square white plate with a golden fork and floral print towel

Rhubarb Bars with Oatmeal

As spring reaches its peak, our family has enjoyed making our favorite rhubarb desserts, so I’ve been experimenting with some new rhubarb recipes. I simply can’t get enough fresh rhubarb whenever it is available.

When the tartness of rhubarb is combined with sweet, crunchy oatmeal topping, the result is sure to be a success. And these Rhubarb Oatmeal Bars? They’re a hit.

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Overhead shot of rhubarb bars with crunchy oatmeal topping, served on a round wooden cutting board with a striped gray and white towel

The thick and chewy oatmeal crust on these rhubarb bars provides a satisfying crunch, and allows you to pick up a bar without worrying about whether it will hold together.

Without being too tart or too sweet, the perfectly balanced flavor of the rhubarb filling gives a bright burst of flavor to every bite.

Whether they’re served as a snack out of hand, or as a warm dessert topped with a scoop of ice cream after dinner, Rhubarb Oatmeal Bars are a hit.

Close-up shot of dry ingredients coating rhubarb in a glass bowl

Rhubarb Bars with Oatmeal

You’ll need the following ingredients to make this recipe:

Filling Ingredients

  • Rhubarb, sliced into ½-inch pieces
  • Sugar
  • Cornstarch
  • Cinnamon
  • Kosher salt
  • Lemon juice
Close-up shot of melted butter being poured into a glass bowl filled with chopped rhubarb and dried ingredients

Crust Ingredients

  • All-purpose flour
  • Light brown sugar
  • Old fashioned oats
  • Butter, melted
sugared rhubarb in baking pan

Oatmeal Rhubarb Bars

Start by preheating the oven to 400°F. Grease a 9×13 pan with butter and set aside. In a large mixing bowl, combine the rhubarb, white sugar, cornstarch, cinnamon, and salt and stir to coat.

Add the lemon juice and stir again. Let the rhubarb mixture rest while preparing the crust.

Oatmeal crust for rhubarb bars

While the rhubarb mixture rests, start preparing the topping by combining the flour, oats, and brown sugar in another bowl. Add the melted butter, and stir to combine.

Press half of the dry mixture into a buttered 9×13 pan. Next, pour the rhubarb mixture over the bottom crust. Finally, sprinkle the rest of the dry mixture on top.

Overhead shot of rhubarb oatmeal bars prepared in a sheet pan lined with parchment paper, ready to bake

Bake for 26-30 minutes; the crust should be golden brown. Let cool completely before slicing into bars.

Serve on their own or warmed and topped with ice cream.

Rhubarb Oatmeal Bars topped with Ice Cream on small square plates

Rhubarb Bar Recipes

Can’t get enough rhubarb recipes? These simple Rhubarb Bars with a shortbread crust and tangy rhubarb custard filling are a fun, easy spring dessert.

This Double Crumb Rhubarb Coffee Cake serves as the perfect excuse to eat cake for breakfast.

With only one bowl, this simple, old-fashioned Rhubarb Cake with Butter Sauce is a twist on classic Christmas desserts that’s great for all seasons.

Rhubarb Cookies get rave reviews every single time someone tries them. The rhubarb keeps them extra soft and gives a fun flavor twist to old-fashioned oatmeal cookies.

Rhubarb bars with crunchy oatmeal topping, served on a square white plate with a golden fork and floral print towel

Rhubarb Oatmeal Bars

5 from 5 votes
Slightly chewy and sweetly tart, these Rhubarb Oatmeal Bars combine a crunchy oat topping with flavorful rhubarb for a dessert the whole family will love.
Prep Time: 15 minutes
Cook Time: 25 minutes
Total Time: 40 minutes
Course: Dessert
Cuisine: American
Servings: 12

Ingredients 

Rhubarb Filling Ingredients

  • 2 pounds rhubarb sliced into ½-inch pieces, about 6 cups
  • cup sugar
  • 3 tablespoons cornstarch
  • ½ teaspoon cinnamon
  • ½ teaspoon kosher salt
  • 1 tablespoon lemon juice

Crust Ingredients

  • 2 cups all-purpose flour
  • 1 cup light brown sugar
  • cups old fashioned oats
  • 1 cup butter melted

Instructions

  • Preheat oven to 400°F. Grease a 9×13 pan with butter and set aside. Combine the rhubarb with the white sugar, cornstarch, cinnamon, and salt in a large mixing bowl.
  • Stir to coat the rhubarb and add the lemon juice. Stir again and the let the rhubarb rest while preparing the crust.
  • In a separate mixing bowl, combine the flour, oats, and brown sugar. Add then melted butter. Stir to combine.
  • Press half of this mixture into a buttered 9×13 pan. Pour the fruit over the bottom crust and then sprinkle the rest of the dry mixture on top.
  • Bake for 26-30 minutes, until the crust turns golden brown. Let cool completely and slice into bars.

Nutrition

Calories: 369kcal · Carbohydrates: 54g · Protein: 4g · Fat: 16g · Saturated Fat: 10g · Polyunsaturated Fat: 1g · Monounsaturated Fat: 4g · Trans Fat: 1g · Cholesterol: 41mg · Sodium: 229mg · Potassium: 291mg · Fiber: 2g · Sugar: 30g · Vitamin A: 550IU · Vitamin C: 7mg · Calcium: 92mg · Iron: 2mg
Tried this recipe?Mention @chocolatewithgrace or tag #chocolatewithgrace!
Overhead shot of rhubarb bars with crunchy oatmeal topping, served on a round wooden cutting board with a striped gray and white towel

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  1. Bob says

    5 stars
    My rhubarb is the green variety. I’d previously made a disastrous rhubarb buckle recipe that I found on Pinterest. But then I found this recipe and it came out perfect. I used three small casserole dishes and they each serve 4, I made three and shared them! Thank you! I might get one more small harvest so I’ll make this again!

  2. Chris Milbrand says

    5 stars
    Really enjoyed this recipe. Easy to make and great to eat. My husband is eating it like crisp with some whipped topping. I enjoyed it a bars. Great texture and not too tart or sweet. Just perfect