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 light brown sugar using an electric mixer on medium speed until pale, light, and fluffy, about 3 minutes.
03 - Add 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 dry ingredient mixture to the wet ingredients on low speed, mixing just until the flour is incorporated. Do not overmix.
06 - Using a spatula, gently fold in the chocolate chips, chopped maraschino cherries, and walnuts if using, distributing them evenly throughout the dough.
07 - Drop rounded tablespoon-sized scoops of dough onto the prepared baking sheets, spacing each mound about 2 inches apart to allow for spreading.
08 - Bake one sheet at a time for 10 to 12 minutes, rotating halfway through, until the edges are lightly golden and the centers appear set but still soft.
09 - Let the cookies rest on the baking sheet for 5 minutes, then carefully transfer to a wire cooling rack to cool completely before storing.