Melt butter in a large skillet.
Add peaches, bourbon, brown sugar, and nutmeg.
Sauté over medium low heat until peaches are soft, about 3-4 minutes.
Let cool.
Transfer into blender and purée until completely smooth and no chunks of peaches remain. Set aside.
Heat oven to 350℉/177℃.
Spray three 8-inch cake pans with baking spray. Set aside.
In a large bowl, whisk together flour, sugar, baking powder, and salt. Set aside.
In a medium bowl, whisk together milk, eggs, oil, vanilla, and peach purée.
Pour wet ingredients over dry ingredients.
Whisk until well mixed.
Divide batter evenly among prepared pans.
Bake for 30 minutes, or until cake tests done.
Allow to cool in pans before turning out.