Preheat your oven to 375°F (190°C). Gather your mixing bowls and baking sheets.

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

Add the eggs one at a time, mixing well after each addition.

Gradually add the flour, baking soda, and baking powder, folding until just combined.

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

Drop spoonfuls of dough onto prepared baking sheets, leaving space between each.

Bake for 10-12 minutes, or until the edges are golden brown.

Let the cookies cool on the baking sheets for 5 minutes before transferring to a wire rack.