Gather the ingredients - * Blueberries * Butter * Granulated sugar * Lemon juice * Cornstarch * All-purpose flour * Cinnamon * Salt * Milk * Vanilla extract
– Place butter in a 9"x13" baking dish and place in the oven. Preheat the oven to 350 degrees F and remove the baking dish once the butter has melted. - Meanwhile, stir together the blueberries, sugar, lemon juice, and cornstarch until the blueberries are evenly coated.
Pour the blueberries over the melted butter in an even layer.
In a large bowl, stir together the flour, sugar, baking powder, and cinnamon. Add the milk and vanilla, mixing to combine. Pour the batter over the blueberries.
Bake in the preheated oven for 30-35 minutes, or until the filling is bubbling and the topping has turned golden.
Serve warm with ice cream.