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Preheat oven to 375 F. Grease a 9-inch square baking pan with cooking oil spray.
In a large mixing bowl, combine blueberries, lemon juice, flour, and sugar. Gently toss to combine. Evenly distribute the blueberry mixture into the greased pan.
In another mixing bowl, combine softened butter, oats, flour, sugar, and cinnamon. Stir together with a rubber spatula until combined. Evenly distribute the topping on top of the blueberry layer.
Bake for 35 to 40 minutes until the top is lightly browned. Place on a wire cooling rack to cool down for 10 minutes, then serve warm with whipping cream or a scoop of vanilla ice cream.