Toss first 5 ingredients together to coat. Place on baking sheet covered with a piece of parchment paper. Roast fruit in oven for 20 minutes at 300-degrees F.
If you are baking your cobbler in a cast iron skillet – on medium heat melt you butter, don’t let it burn. Set aside (you will add your batter here later)
If you are baking in a glass or metal pie pan, you will need to butter your pan and flour.