In a large bowl, add the blueberries, granulated sugar, and cinnamon. Stir until combined.
Cobbler
In a large bowl, add in the sugar, flour, baking powder, baking soda, and salt. Whisk until combined.
Add in the milk and whisk until smooth. It will be pretty runny.
Pour the butter into a 9x13 baking dish.
Add the blueberry mixture on top of the butter.
Pour the batter on top of the blueberries.
Place the baking dish in the oven and bake for 55 minutes to 1 hour until the top is set and golden brown. Gently push on the center of the cobbler. If it's firm, it's ready. You can also poke a skewer in just the cobbler to make sure it comes out clean.
Serve warm with vanilla ice cream or whipped cream.
Cover and store in the fridge.
Notes
Storage: You can store your cobbler covered with plastic wrap at room temperature for 1 to 2 days or in the refrigerator for 3 to 5 days. Freeze: Once the cobbler has cooled completely, place in a freezer container or wrap with two layers of plastic wrap and a layer of heavy-duty aluminum foil. Place in the freezer for up to 3 to 4 months. Thaw: Place in the fridge overnight to thaw.