Preheat oven to 375. Spray Dutch Oven lightly with cooking spray
Pour blueberries into bottom of Dutch Oven.
Cream 1/4 cup white sugar and 1/2 cup brown sugar with one stick softened butter. To cream these ingredients, use a hand mixer to fully incorporate the sugars into the butter.
Add salt, flour, baking powder and milk and continue mixing until a batter is formed. If your batter isn't spreadable, add 1/8-1/4 cup more milk.
Spread the batter over the blueberries
In a separate bowl, mix together white sugar, corn starch and a pinch of salt.
Sprinkle sugar mixture over all of batter
Heat 1/4 cup water in microwave for 40 seconds.
Pour water over all of the sugar - making sure that every grain of sugar is coated because THIS is where the magic happens!
Bake uncovered at 375 for 55-60 minutes or until the cobbler topping is done. Test with a cake tester or toothpick - if it comes out clean - it's done. Top should be golden brown.
Serve with vanilla ice cream or whipped cream