Preheat oven to 375F.
Mix ½ cup of milk and apple cider vinegar for the topping together and set aside.
Place the 2 tablespoon of coconut oil in the bottom of a 8x8 baking dish and place in the oven while it preheats so that oil melts.
Combine all ingredients for the blueberry filling in a large bowl and mix well. Set aside.
Combine dry ingredients for the biscuit topping in a medium bowl.
Cut the coconut oil into the flour mixture until you have a sand like texture with small pebbles of oil.
Add the whisked egg and buttermilk and mix to combine until dough comes together.
Pour blueberry mixture into the prepared baking pan. Use a large cookie scoop to scoop cobbler topping evenly over the top of the blueberries.
Brush the top of the cobbler with the extra milk and sprinkle with sugar.
Bake for 30-35 minutes until top is golden brown, edges are crisp, blueberries are bubbling, and a toothpick comes out just clean.
Let cool on a wire rack.