In a bowl mix together flour, milk, 1 cup sugar, & butter until batter forms. Pour into a greased 4 qt crockpot. Sprinkle in the washed blackberries. Top with the final 1/4 cup of sugar.
Cover and cook on high 2 - 2 1/2 hours.
Serve with ice cream or whipped cream.Gluten Free
Use a gluten free flour mix.Dairy free
Use a milk substitute like almond milk, and coconut oil or vegetable oil in place of the butter.