To Make Peach Filling: In a large saucepan combine 1/2 cup sugar, cornflour and cinnamon. Stir in peaches and lemon juice, tossing until peaches are evenly coated.
Cook filling over medium heat, stirring constantly until mixture thickens and boils. Boil 1 minute. Pour mixture into an ungreased casserole dish. Keep mixture hot in oven while you make topping.
To Make Topping: In a medium bowl combine flour, 1 tablespoon sugar, baking powder and salt. Mix thoroughly then cut in copha until mixture looks like fine crumbs. Add milk and stir until mixture is evenly moistened.
Remove peach filling from oven and drop dough onto peaches in 6 equal-size spoonfuls.
Return cobbler to oven and bake 25 to 30 minutes or until topping is golden brown.