Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper if desired.
In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy.
Beat in the eggs one at a time, then stir in the vanilla extract.
In a separate bowl, whisk together the rolled oats, flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Fold in the chocolate candies and shredded coconut (if using).
Using a cookie scoop or tablespoon, drop rounded balls of cookie dough onto the prepared baking sheet, leaving space between each cookie.
Bake in the preheated oven for about 12 minutes or until the edges are lightly golden.
Remove from the oven and let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.