Preheat oven to 400°F. Line cookie sheet with parchment paper. Center the pie crust on the prepared pan in a 12 inch circle. Combine apples, brown sugar, flour, cinnamon and nutmeg in a large bowl; set aside. Spoon the apple filling in center of dough, leaving a 2-inch border uncovered. Sprinkle filling with pecans; dot with butter. Fold outer dough onto apples, pleat the edges, and leave opening in the center. Brush dough lightly with milk; sprinkle with sugar. Bake 30 minutes or until crust is golden brown. Cover the galette with a sheet of Aluminum Foil to prevent over browning. Continue baking 5 to 10 minutes longer or until juices bubble and apples are tender. Cool 10 minutes before cutting. Serve warm.