This is basically an all purpose cobbler because you can use frozen peaches or cherries as well. This looks great served in a bowl with a dollop of whipped cream and a mint sprig.
2 (16 oz.) packages frozen blackberries
2 cups sugar, divided
¼ cup butter
3 (8 oz.) packages cream cheese, softened
2/3 cup milk
2 ¼ cups all-purpose baking mix
¾ cup uncooked oats
Bring blackberries, 1 1/3 cups sugar, and butter to a boil in a large saucepan over medium heat, stirring gently until butter is melted and sugar dissolves; remove blackberry mixture from heat.
Beat cream cheese and remaining 2/3 cup sugar at medium speed with an electric mixer until fluffy; add 2/3 cup milk, and beat until smooth. Stir in baking mix and uncooked oats.
Spread two-thirds of the cream cheese mixture (about 3 cups) onto bottom of a lightly greased 13 x 9 inch baking dish; spoon blackberry mixture evenly over cream cheese mixture.
Dollop remaining cream cheese mixture evenly over blackberry mixture.
Bake at 350 degrees for 35 minutes or until golden brown.