Place the butter in the 9x13" pan and place it in the oven. Preheat your oven to 350℉. The butter will melt as you complete the other steps. (Note: if you are a new baker and a little bit slow, wait to do this until after you've mixed up the batter, as the butter may get too hot and over-brown. It's better to wait a bit while the butter melts than scorch it!)
½ c butter
Mix together your spices with a fork in a small bowl.
In a medium saucepan, combine peaches, white sugar, water, and about half of the spice mixture.
4 c fresh peaches, 1 c white (granulated) sugar, ½ c water
Heat to boiling stirring continuously, then turn the heat down and simmer for 10 minutes, stirring occasionally.
While the peaches are simmering, whisk together the rest of the spice mixture, flour, baking powder, salt, and light brown sugar in a mixing bowl. Make sure to get rid of any lumps from the brown sugar.
1 ½ c all-purpose flour, 1 ¾ tsp baking powder, ½ tsp salt, 1 c light brown sugar
Slowly stir in the milk until the batter is smooth and there are no pockets of flour.
1 c whole milk
When the peaches are done simmering, turn off the heat and set them on a cold burner.
Get your pan out of the oven (the butter should be melted) and set it on a trivet, or on top of your stove.
Carefully pour the batter over the melted butter. DO NOT mix them together. You may use a rubber spatula to gently push batter over any holes or towards any empty corners. The melted butter will swirl around the batter - that's what you want!
Spoon the peaches and their syrup over the batter.
Bake at 350℉ for 30 minutes, or until a fork inserted into the cake part (not a peach!) comes out clean.
Cool for 5 minutes before serving with a generous helping of vanilla ice cream.