Preheat the oven to 400F then slice the butter and place it in a 9x13 inch baking dish and place in the oven while the oven preheats to melt the butter.
5 tablespoon butter
In a large bowl, mix the blueberries with the sugar and lemon zest. Stir to combine.
4 cup blueberries, ⅓ cup granulated sugar, 2 teaspoon lemon zest
In a separate bowl, whisk all-purpose flour, sugar, cornstarch, baking powder, and salt until combined. Add in the milk and whisk until a batter forms.
1 cup all-purpose flour, ¾ cup granulated sugar, 1 tablespoon cornstarch, 2 teaspoon baking powder, ¼ teaspoon salt, ¾ cup milk
Evenly distribute the blueberry mixture in the prepared pan once the butter is melted. Drizzle the batter over the blueberries and bake in the preheated oven for 25-30 minutes. You'll know it's ready when the fruit is bubbly at the edge and a toothpick inserted in the cobbler part comes out clean.
Allow it to cool down a little bit before serving it with some whipped cream, a drizzle of heavy cream, or vanilla ice cream.