Preheat the oven to 350ºF. and spray a 9" round baking dish or pie plate with cooking spray. Set aside.
Toss the blueberries, cornstarch and lemon juice together in a mixing bowl; set aside.
In a separate mixing bowl, whisk together the flour, sugar, baking powder, nutmeg, and salt. Form a well in the center of the bowl.
In small bowl, stir together the oil, vanilla, and egg whites until fully combined.
Add the egg white mixture to the well you created in the flour mixture. Stir the wet ingredients into the dry ingredients until just moist; set aside.
Pour the berry mixture into the pie plate. Then, drop the dough by spoonfuls evenly onto the blueberry mixture to cover evenly.
Combine the additional 2 teaspoons sugar and 1 teaspoon cinnamon to form cinnamon sugar. Sprinkle evenly over the top of the pie dish.
Bake for 40-45 minutes or until the blueberries are bubbling and the topping is golden.
Once baked, allow the cobbler to cool on a wire cooling rack for about 15 minutes before enjoying. The longer it cools and firms up, the better the consistency when spooning out to serve. Pair with a scoop of vanilla ice cream or a dollop of whipped cream!