Preheat the oven to 350 degrees.
In a greased 9x13 pan stir together the Bisquick, milk, nutmeg, cinnamon, vanilla, and corn starch. Gently whisk together until thoroughly mixed.
Pour 1/2 cup of the melted butter over the top and gently mix.
In a mixing bowl mix the peaches and 1 cup sugar together and stir.
Spoon the batter over the mixture in the 9x13 pan. DON'T stir, just set it aside.