Preheat the oven to 200 ° (160 ° with convection). Cut the peaches into large pieces and place in a baking dish. Melt the butter over a mild heat and add the other ingredients. Spread the mixture evenly over the peaches. Bake on the middle rack for about 40 minutes, until the surface is golden brown and bubbles. Let cool a little and serve with thick, sweet cream or vanilla sauce.