Preheat the oven to 350 degrees F and line two large baking sheets with parchment paper.
Add butter and brown sugar to the bowl of a stand mixer fitted with the paddle attachment. Beat together on medium speed until well combined, usually about 2 minutes.
Next, add the egg and vanilla extract. Mix to combine and scrape down the sides of the bowl if needed.
Next, add the oats, flour, and baking soda. Mix again until just combined.
Finally, add the chocolate chips, shredded coconut, and chopped pecans. Fold them gently into the cookie dough so you don't break the pecans.
Scoop out two-tablespoon sized balls and place them on the prepared baking sheets. Make sure to place them at least 2” apart as the cookies spread while they're baking.
Bake the cookies for 12-14 minutes or until the cookies are just set and beginning to brown around the edges.
Allow the cookies to cool for 2 minutes on the pan, and then transfer them to a wire rack.