Old Fashioned Rhubarb Oatmeal Bars

5 from 4 votes

Old Fashioned Rhubarb Oatmeal Bars

Rhubarb Oatmeal Bars are sweet and tart with a brown sugar oatmeal cookie crust, gooey fruit filling, and a buttery oatmeal crumble topping. This delicious cookie bar recipe comes together in minutes with fresh or frozen rhubarb.

Prep Time10

Cook Time50

Course: Dessert

Cuisine: American

Servings:

Calories: 232kcal

Author: Cara Lanz

Ingredients

1 ½ cups flour
1 ½ cups old fashioned rolled oats
1 cup brown sugar
1 teaspoon cinnamon
½ teaspoon baking powder
¼ teaspoon salt
¾ cup melted butter
3 cups rhubarb, fresh or frozen
½ cup sugar
1 tablespoon corn starch
¼ teaspoon salt
1 tablespoon orange juice
2 teaspoons orange zest

US Customary - Metric

Instructions

Heat oven to 350 degrees.
Line a 9x9 pan or baking dish with parchment paper. The bars shouldn’t stick to the pan, but the parchment makes it easier to remove them out of the pan.
In a large bowl, add the all purpose flour, oats, brown sugar, cinnamon, baking powder and salt. Use a spoon to break up the brown sugar and stir the oat mixture together.
Add the melted butter and stir until it comes together like clumps of wet sand.
Pat ⅔ of the mixture into the bottom of the pan. Bake the crust for 10 minutes.
In a medium bowl, combine rhubarb, sugar, cornstarch, orange juice, orange zest, and salt together.
Arrange the fruit mixture over the bottom crust. Crumble the remaining crumb mixture over the top.
Bake for 30-40 more minutes or until the top is golden brown.
Dig in right away to enjoy a warm and gooey rhubarb bar with a scoop of ice cream or chill them in the refrigerator until they're set up (the fruit filling will still be nice and gooey!).
Add a dusting of powdered sugar on top of the bars, if you like.
Store old fashioned rhubarb bars in an airtight container in the refrigerator. The crust and topping will soften the next day, but these rhubarb bars will still be really delicious.

Video

Notes

If you use frozen rhubarb, do not thaw it first.

For a warm rhubarb crisp-like dessert, go ahead and dig into these oatmeal rhubarb crumble bars right away.

For a firmer bar-like consistency, chill them in the refrigerator.

Nutrition