Strawberry Rhubarb Crumble Bars are such a delicious summertime treat! They are so easy to make and loaded with sweet strawberries, brown sugar, oats, and fresh rhubarb - it will be hard to stop at just one.
Combine the rhubarb, strawberries, and lemon juice in a medium saucepan. Cover and cook on medium heat for 8 - 12 minutes or until fruit is tender, stirring occasionally.
1½ cups fresh rhubarb, 1 ½ cups sliced fresh strawberries, 1 tablespoon lemon juice
Mix together the ½ cup granulated sugar and cornstarch in a bowl. Stir into the fruit mixture. Continue cooking, stirring constantly until the mixture comes to a boil. Continue boiling one minute, stirring constantly. Remove from heat and set aside.
½ cup granulated sugar, 2 tablespoons cornstarch
Preheat the oven to 350°F and grease your 13 x 9 baking pan with butter.
Combine all crust ingredients in a bowl. Using a pastry blender or the back of a fork, combine the ingredients until they resemble coarse crumbs.
1 ½ cups all-purpose flour, 1 ½ cups old fashioned oats, 1 cup brown sugar, ¾ cup butter, ½ teaspoon baking soda, ¼ teaspoon salt
Reserve 1 ½ cups crumb mixture. Press the remaining crumb mixture into a greased 13x9 baking pan using a spatula or the back of a fork. Spread filling over the crust. Sprinkle with the reserved crumb mixture.
Bake 30-35 minutes or until golden brown. Cool completely.
How to make the glaze (optional):
Whisk together one tablespoon of milk with the powdered sugar until you have a good frosting consistency. If you prefer a thicker glaze, add another tablespoon. (My family likes it thicker so we make it with one tablespoons.)