Preheat oven to 400 degrees. Place the fruit in a mixing bowl. add sugar, cinnamon, salt and cornstarch. Stir to coat and the add orange juice. Stir again and set aside.
In a separate mixing bowl, combine the remaining dry ingredients and then add the melted butter. Stir to combine. Press half of this mixture into a buttered 9×13 pan. Pour the fruit over the bottom crust and then sprinkle the rest of the dry mixture on top.
Bake for 30-35 minutes, until the crust turns golden brown, Serve warm from the oven or let cool completely and slice into servings.