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Preheat the oven to 350 degrees. Lightly spray a 13- by 9-inch baking dish with cooking spray.
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Arrange the raspberries and peaches in an even layer in the bottom of the baking dish. Sprinkle the jello powder over that, then top with the sugar.
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Sprinkle the cake mix powder over all of that, then top with the melted butter and the cold water. Bake for 45 minutes to an hour, until the top is lightly browned and the fruit juices are bubbling.
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It’s possible to serve your cobbler warm but it’s MUCH easier to serve if you chill it for a couple of hours, until it sets up a bit. Serve with whipped cream or ice cream if desired.
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Uneaten cobbler can be stored in the fridge, covered, for up to 4 days or frozen in individual airtight containers for up to 2 months.