Preheat your oven to 350°F (175°C) and line your baking sheets with parchment paper.

In a large mixing bowl, cream together the unsalted butter, granulated sugar, and brown sugar until light and fluffy.

Add the eggs one at a time, beating well after each addition, then stir in the vanilla extract.

In a separate bowl, whisk together the all-purpose flour, baking soda, ground cinnamon, and salt.

Gradually pour the dry mixture into the wet mixture, mixing gently until just combined.

Fold in the peeled and diced apples and chopped walnuts if using.

Drop tablespoon-sized balls of dough onto the prepared baking sheets, spacing them about 2 inches apart.

Bake for 12-15 minutes or until the edges are lightly golden, then cool on wire racks.

In a small bowl, whisk together the powdered sugar, maple syrup, and enough milk to achieve a smooth glaze consistency.

Once cooled, drizzle the glaze generously over the cooled cookies and enjoy.