• Preheat your oven to 350°F (175°C). Lightly grease a 10 x 7-inch glass baking dish.
• In the prepared dish, combine the blueberries, cornstarch, 2 tablespoons of sugar, and lemon juice. Toss until berries are coated.
• In a medium bowl, whisk together the flour, ½ cup of sugar, baking powder, and salt.
• Add the cold, diced butter to the dry ingredients. Mix until the mixture resembles coarse crumbs.
• Stir in the buttermilk and vanilla extract until the dough comes together. Be careful not to overmix.
• Spoon the dough over the blueberry mixture in the baking dish, leaving some gaps for filling to bubble up.
• Sprinkle coarse sugar over the top of the dough, if desired.

Baking

• Bake for 50-55 minutes until the top is golden brown and the filling is bubbling.
• Allow cobbler to cool for 20-30 minutes before serving.
• Enjoy warm or at room temperature, ideally with ice cream or whipped cream.