Preheat oven to 375 degrees. Combine peaches and brown sugar. Using a rolling pin, roll each biscuit to a 6-7 inch circle. Place 2 tablespoons or about 3 slices of peach/brown sugar mixture on one half of flattened biscuit. Fold biscuit over and seal using fork. Line a cookie sheet with parchment paper. Place turnover on parchment paper.
Optional- sprinkle with granulated sugar or brush with beaten egg. (Sometimes I do this step, sometimes I don't. They taste the same either way. They're just prettier with the topping.)