Preheat oven to 350 F
Start by making the berry mixture: In a saucepan, mix your 8 cups of berries with 2 cups water and 1 1/2 cups sugar.
Bring to a boil, then reduce heat to low and simmer for 10 minutes, stirring occasionally.
While the berries are cooking, place the butter into an 11 x 15 baking pan and put in the oven to melt.
Mix together the sugar, flour, baking powder, and salt. A whisk works well for this to evenly incorporate everything.
Slowly add the milk to the flour mixture while stirring to prevent lumps in the batter.
Once the butter is melted, remove the pan from the oven. Pour the batter directly into the pan with the butter WITHOUT STIRRING.
Use a slotted spoon to carefully add the berries on top of the batter. Then, gently pour the syrup from the berries on top. Not all the syrup will fit - that's okay. Don't overfill the pan or your cobbler will spill in the oven as it bakes. Leave some space at the top of your baking dish for the cobbler to rise. DO NOT STIR!
Bake for 35-45 minutes or until golden brown.
Serve warm with vanilla ice cream.