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Preheat your oven to 375°F. Lightly grease an 8x8 inch baking dish or a 9-inch pie plate.

In a medium bowl, gently combine the fresh blueberries, granulated sugar, lemon juice, cornstarch, and vanilla extract. Toss until the blueberries are evenly coated. Pour the blueberry mixture into the prepared baking dish, spreading it into an even layer.

In a separate large bowl, combine the old-fashioned rolled oats, all-purpose flour, light brown sugar, cinnamon, and salt. Mix well to ensure all dry ingredients are evenly distributed.

Pour the melted unsalted butter over the oat mixture. Stir with a fork until the mixture is crumbly and well combined, resembling wet sand.

Evenly sprinkle the oatmeal topping over the blueberry filling in the baking dish, covering it completely.

Bake for 30-35 minutes, or until the topping is golden brown and the blueberry filling is bubbly around the edges. If the topping starts to brown too quickly, you can loosely tent it with aluminum foil.

Remove from the oven and let cool for at least 10-15 minutes before serving. This allows the filling to set slightly.

Serve warm with a dollop of whipped cream or a scoop of vanilla ice cream, if desired.


Preheat your oven to 375°F. Lightly grease an 8x8 inch baking dish or a 9-inch pie plate.

In a medium bowl, gently combine the fresh blueberries, granulated sugar, lemon juice, cornstarch, and vanilla extract. Toss until the blueberries are evenly coated. Pour the blueberry mixture into the prepared baking dish, spreading it into an even layer.

In a separate large bowl, combine the old-fashioned rolled oats, all-purpose flour, light brown sugar, cinnamon, and salt. Mix well to ensure all dry ingredients are evenly distributed.

Pour the melted unsalted butter over the oat mixture. Stir with a fork until the mixture is crumbly and well combined, resembling wet sand.

Evenly sprinkle the oatmeal topping over the blueberry filling in the baking dish, covering it completely.

Bake for 30-35 minutes, or until the topping is golden brown and the blueberry filling is bubbly around the edges. If the topping starts to brown too quickly, you can loosely tent it with aluminum foil.

Remove from the oven and let cool for at least 10-15 minutes before serving. This allows the filling to set slightly.

Serve warm with a dollop of whipped cream or a scoop of vanilla ice cream, if desired.
