Preheat the oven to 375 F degrees.
Mix the first three ingredients in a small pan: sliced peaches, sugar, and salt, and cook for a few minutes until the sugar dissolves.
Canned peach can be used as well; about 15oz will suffice. If you're using canned peach, you don't need to boil it with sugar as listed in the previous step.
Cut butter and melt on a baking sheet. I used a 10x6 (you can use size 9x9) casserole dish or pan; remove the baking sheet and set aside.
Whisk flour, sugar, baking powder, salt, and nutmeg in a mixing bowl.
Add milk and mix until smooth, making sure no lumps.
Add the batter to the melted butter; use a spatula to spread the batter.
Spread out the sliced peaches mixture (I reserved some slices). If you desire, sprinkle some cinnamon powder.
Bake for about 35 minutes or until the top is golden and fully baked; test it with a toothpick.
Serve with cookies and ice cream, and enjoy! I added some peaches I reserved while adding to the batter.