Heat butter in a skillet over medium-high heat. Add brown sugar, cinnamon, nutmeg and salt to the skillet. Stir to combine. Once ingredients have melted together, add apple wedges and stir to coat evenly. Cook over medium-high heat, stirring occasionally, for 15 minutes or until soft and caramelized.
Divide apple mixture between four serving dishes and top with chunks of pie crust. Garnish with icing sugar.