Cook diced apples with a small amount of sugar and cinnamon until just softened. Cool completely. Preheat oven to 350°F. Mix flour, baking powder, baking soda, spices, and salt. Cream butter and brown sugar. Add egg and vanilla. Mix in dry ingredients gently. Fold in cooled apples. Scoop dough onto baking sheet. Bake 12–15 minutes until edges set. Cool and drizzle with glaze.