Begin by preheating your oven to 350°F (175°C). Line your baking sheets with parchment paper.

In a large mixing bowl, combine the softened unsalted butter, brown sugar, and granulated sugar. Beat until light and fluffy.

Add the large eggs and vanilla extract, mixing until fully incorporated.

In a separate bowl, whisk together all-purpose flour, baking soda, and salt. Gradually combine with the wet ingredients until just incorporated.

Fold in the old-fashioned rolled oats and semi-sweet chocolate chips until evenly distributed.

Drop spoonfuls of cookie dough onto the prepared baking sheets, spacing them about 2 inches apart.

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

Allow the cookies to cool on the baking sheet for about 2 minutes before transferring them to wire racks.