Blackberry and strawberry Cobbler

I found this new recipe for Blackberry Cobbler.  The problem was I only had 2 cups of blackberry's and it calls for 3 so I used a cup of strawberries.  Here is the recipe hope you all enjoy it as much as my family. As you can tell my family got to it before I took the picture.

 3 Cups of Blackberries or ( 2 cups blackberries 1 cup strawberries)
1 cup sugar
1/4 tsp. Cinnamon
3 Tbsp. cornstarch
1 cup cold water
1 Tbsp. butter
 Biscuit Topping:
1 1/2 cups all purpose flour
1 Tbsp sugar
1 1/2 tsp. baking powder
1/2 tsp. salt
1/2 cup cold butter
1/2 cup 2% milk
Whipped topping or vanilla ice bream, optional

In a large saucepan, combine the blackberries, sugar and cinnamon.  Cook and stir until mizture comes to a boil. Combine the cornstarch and water until smooth: stir into fruit mixture. Bring to a boil; cook and stir for 2 minutes or until thickened. Pour into greased 8 Inch square baking dish. Dot with butter.
For topping, in a small bowl, combine the flour, sugar, baking powder and salt. Cut in butter until mixture resembles coarse crumbs. Stir in milk just until moistened. Drop by tablespoons onto hot berry mixture.
Bake uncovered, at 350 for 30-35 minutes or until filling is bubbly and topping is golden brown. Serve warm with whipped topping or ice cream.