01 - Preheat oven to 350°F. Line two baking sheets with parchment paper and set aside.
02 - In a large mixing bowl, beat the softened butter, granulated sugar, and packed light brown sugar using an electric or stand mixer until pale, light, and fluffy—approximately 3 to 4 minutes.
03 - Add the eggs one at a time, beating well after each addition. Pour in the vanilla extract and mix until fully incorporated.
04 - In a separate medium bowl, whisk together the all-purpose flour, baking soda, and salt until evenly distributed.
05 - Gradually add the flour mixture to the creamed butter mixture, mixing on low speed just until no dry streaks remain. Avoid overmixing to keep the cookies tender.
06 - Using a spatula, gently fold in the semi-sweet chocolate chips, chopped maraschino cherries, and walnuts (if using) until evenly distributed throughout the dough.
07 - Drop rounded tablespoon-sized scoops of dough onto the prepared baking sheets, spacing each portion about 2 inches apart to allow for spreading.
08 - Bake for 10 to 12 minutes, rotating the sheets halfway through, until the edges are lightly golden and the centers appear set but still soft.
09 - Let the cookies rest on the baking sheets for 5 minutes to firm up, then transfer to a wire cooling rack to cool completely.