To a large bowl, add the soft butter and sugar. Combine it quickly a bit.
Stir in some of the milk and flour to the butter and sugar and combine as good as possible.
Pour some more milk and flour and mix it in again to a semi-smooth batter.
Pour in remaining milk and flour. Add the baking powder and salt too. Stir to combine to a smooth lump-free batter.
To assemble
Place peach slices into a casserole baking pan.
Cover peach with the batter. They don't need to be completely covered.
Sprinkle some brown sugar over the batter.
Bake at 400 Fahrenheit/ 200 Celsius for about 30-35 minutes or until the top is golden brown and bubbly.
Video
Notes
Choose if you want to use canned, fresh, or frozen fruits. If you use canned, make sure to add without syrup. See instructions for fresh and frozen fruits in the post.