Preheat the oven to 350 degrees F. In a 9×13 inch pan, add the frozen or fresh berries. If they are frozen there is no need to thaw.
Add the zest of 1 lemon and 1 tablespoon lemon juice.
Add 3/4 cup sugar, 1/2 cup flour, and 1 tablespoon cornstarch.
Stir the dry ingredients into the berries.*
In a separate bowl, melt the butter. Add the dry cake mix and stir slightly, it’s okay if there are some dry spots. Spoon the mixture over the top of the berries.
Bake the cobbler at 350 degrees for about 40-50 minutes, until the top starts to turn golden and the berries are bubbly.
Let cool for a few minutes, then serve warm with vanilla ice cream or whipped cream!