Slice 8 tablespoons butter into pieces and place them in the bottom of a 9x13 baking dish. Place the dish in the oven and allow the butter to melt.
In a large mixing bowl, stir together 4 cups blueberries, ½ cup granulated sugar, 1 tablespoon lemon juice, 1 teaspoon lemon zest, and ¼ teaspoon ground cinnamon until the blueberries are well coated.
Carefully remove the baking dish from the oven and pour the blueberry mixture over the melted butter.
In a separate bowl, mix together 1 ¼ cups all purpose flour, 1 cup granulated sugar, 1 ½ teaspoons baking powder, and ¼ teaspoon salt.
Stir in 1 cup whole milk until just combined, then mix in ½ teaspoon vanilla extract.
Drizzle the batter evenly over the blueberry mixture in the baking dish.
Bake for 25–30 minutes until the batter is cooked through and the top is lightly golden brown.
Remove from the oven and let sit for 5–10 minutes before serving.
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Notes
Make sure that the dough is done before removing the cobbler from the oven. The center of the dough should be set and not wet looking. The blueberries around the outside will be bubbly. I used fresh blueberries for this recipe. You can use frozen as well and if so, you do not need to thaw them out before baking. Refrigerate any leftovers in an airtight container for up to 1 week. This is best served warm so reheat the leftovers before serving.