In large bowl, cream butter, brown sugar and egg until blended. Combine flour, nutmeg, baking soda and salt. Add to creamed mixture, mixing well. Stir in chopped apple, walnuts and chocolate.
Drop by small spoonfuls, about 2 inches (5 cm) apart, onto greased cookie sheets. Bake in 375°F (190°C) oven for about 15 minutes or until golden brown. Let cool on racks.