In a bowl, mix together the melted butter and sugar until combined.
Add the eggs and vanilla, then stir in the flour, baking powder, and salt.
Pour the batter over the peaches in the dish.
Bake for about 30-35 minutes, until golden and a toothpick comes out clean.
Serve
Let it cool slightly before flipping onto a plate. Serve warm with a scoop of ice cream or whipped cream for a delightful treat!