Make sure the oven is set to 175 degrees Celsius and turn it on. If the temperature is being shown in Fahrenheit, set it to 350 degrees. Drain all the peaches and fill 3/4th of a cup with the syrup.
Take a saucepan and add mincemeat after crumbling it. Pour the syrup into the saucepan and put it on the stove. Boil the mixture and keep on stirring for around 3 to 4 minutes or until the mixture becomes thick. Add brandy to the mixture and boil it for 1 more minute.
Take a baking dish and spread peach halves over it. Spoon the already-made mixture over the peaches one by one. Place the baking dish with peaches in the oven and bake it for 15 minutes.
Remove the peaches from the oven and sprinkle with pecans if desired. The Brandied Peaches are ready to be served.