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

In a medium mixing bowl, whisk together the flour, baking soda, and salt until well combined.

Cream together the softened butter, brown sugar, and granulated sugar in a large mixing bowl until light and fluffy.

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

Gradually add the dry ingredients to the wet mixture, mixing on low speed until just combined.

Fold in your choice of mix-ins, ensuring they are evenly distributed.

Drop rounded portions of dough onto the prepared baking sheet, leaving space for spreading.

Bake for 10-12 minutes until the edges are golden brown and centers are slightly soft.

Allow cookies to cool on the baking sheet for about 5 minutes before transferring to a wire rack.