Step 1: Preheat the oven to 350°F (175°C).

Step 2: Line a baking sheet with parchment paper.

Step 3: In a large mixing bowl, cream together the unsalted butter, granulated sugar, and brown sugar until light and fluffy.

Step 4: Add the eggs one at a time, mixing well after each addition, then stir in the vanilla extract.

Step 5: In a separate bowl, whisk together the all-purpose flour, baking soda, and salt.

Step 6: Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Step 7: Gently fold in the chocolate chips or your chosen mix-ins.

Step 8: Using a cookie scoop or tablespoon, drop the dough onto the prepared baking sheet, spacing them about 2 inches apart, and bake for 10-12 minutes until the edges are golden and the centers are slightly underbaked for a chewy texture.