Begin by setting up your work area. Gather all the ingredients listed above and make sure your baking sheets are ready.

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

In a large bowl, combine the softened butter, granulated sugar, and brown sugar. Cream together using an electric mixer until light and fluffy (about 2-3 minutes).

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

In a separate bowl, whisk together the flour, baking soda, baking powder, and salt.

Gradually add the dry ingredients to the wet mixture, stirring gently until just combined.

Fold in the oats, chocolate chips, and chopped pecans until evenly distributed.

Scoop dollops of dough onto the prepared baking sheets, spacing them about 2 inches apart.

Bake in the preheated oven for 10-12 minutes or until the edges are golden brown and centers are slightly underdone.

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

Once cool, enjoy your cookies! Pair with milk or your favorite beverage.