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Preheat oven to 350ºF.
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In a large bowl mix oats, brown sugar, flour and melted butter.
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Divide mixture into half and put half of mixture on the bottom of a 9 x 13 pan sprayed with cooking spray. Set aside the other half of the oat mixture.
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Sprinkle rhubarb over oat mixture in 9 x 13 pan and set pan aside.
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In a small sauce pan, mix 1 cup water and sugar and bring to a boil.
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In a small bowl mix cornstarch with a two Tablespoons of cold water to make a slurry,
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Add slurry of cornstarch to the boiling sugar water in the saucepan.
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Remove from heat and add cherry pie filling to saucepan.
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Pour cherry mixture over the rhubarb in the 9 x 13 pan.
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Sprinkle remaining oat mixture over the top of the fruit filling.
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Bake for 45 minutes.
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Allow to cool for 20 minutes.
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Scoop into bowls, serve with vanilla ice cream!