Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
Whisk browned butter, brown sugar, and granulated sugar until combined.
Whisk in eggs, egg yolk, and vanilla.
In another bowl, combine flour, baking soda, cinnamon, salt, oats, coconut, pecans, and chocolate chips.
Fold dry ingredients into the wet mixture just until combined.
Scoop 2-inch balls onto baking sheets, spacing them 2 inches apart.
Bake 12–14 minutes, until edges are golden and centers soft.
Add extra chocolate and pecans on top; sprinkle flaky salt if desired.
Cool 10 minutes on the tray before transferring to a rack.