1. Preheat oven to 375°.
Lightly grease a 10 or 12 inch iron skillet and set aside.
Thinly slice each peach (about ½ inch thick) and place the peach slices in a large mixing bowl.
Add the raspberries, lemon juice, 3 Tablespoons of flour, granulated sugar and ½ teaspoon cinnamon.
Gently stir about 3-4 times or until the flour is absorbed.
Spoon the fruit mixture into the greased skillet.
In a medium mixing bowl, add the rolled oats, brown sugar, ⅓ cup flour, 1 teaspoon cinnamon.
Add the melted butter. Toss to coat evenly.
Sprinkle the oatmeal mixture on top of the fruit, covering the fruit entirely.
Bake for 25-28 minutes or until the fruit is bubbly and the oatmeal crisp is golden brown.