In a medium bowl, stir to combine 1 ½ cups all-purpose flour, ⅓ cup brown sugar, 1 tablespoon baking powder and ¼ teaspoon salt.
Add ⅔ cup whole milk and 3 tablespoons unsalted butter and mix lightly until moistened. Don’t overmix.
Drop this topping over the filling in mounds.
With the back of a spoon or a spatula, spread each mound a little, but don’t cover all the apples.
Bake for about 25 minutes. It will be golden on top, but if you lift the dough it will still have unbaked parts.
Turn the oven down to 325°F (165°C) and bake another 15 minutes, or until very golden and the biscuit topping is dry and done. Lift it here and there carefully with a fork and check that the inside is fully baked.
Remove from the oven and let cool on a wire rack.
Serve warm with whipped cream or a scoop of ice cream.
Store leftover cobbler in the refrigerator, covered in plastic wrap. Or freeze for 3-4 weeks.
Warm before eating.