Preheat your oven to 350°F (175°C).
In a large bowl, toss the sliced apples, sugar, and cinnamon together. Let them sit for about 15-20 minutes to macerate while you prepare the batter.
In another bowl, combine the flour, baking powder, and a pinch of salt. Mix well.
Add the milk and melted butter to the dry ingredients and stir until combined. The batter will be thick and pourable.
Grease a baking dish (about 9×13 inches) and spread the macerated apples evenly at the bottom.
Pour the batter evenly over the apples, using a spatula to spread it out if necessary.
Bake for 30-35 minutes or until the top is golden brown and the apples are bubbly.
Allow the cobbler to cool for a few minutes before serving. Enjoy warm!