Mix berries, butter, cornstarch, sugar and water together and bring to a slow boil on stove top. Let boil a couple of minutes, turn off stove and let cool. This will not be thick.
In a large bowl with a spoon mix together the flour, salt, oil, milk and sugar until makes a ball. Pinch off pieces of the dough and roll out as thin as possible.
Spray a cookie sheet or flat pan with cooking spray and add pieces. Cook in a preheated 400 degree oven for about 10 minutes until brown. You will probably make about 3 pans of these pieces of cooked pastry to total 12 to 15 pieces depending on the size you make them.
Once you have cooked all the pastry pieces start layering them in a serving bowl ladling the berries over the dough. Once you have finished put the cobbler in the refrigerator for several hours or overnight. The pastry will soak up all the juices from the berries. Serve with a big scoop of ice cream and this can’t be beat for a dessert.