Put your baking rack in the Center of the oven and Preheat to 350°
In a separate bowl, whisk together your flour, baking soda and salt. Set aside. Crush your corn flakes and set aside as well.
In the bowl of a stand mixer fitted with the paddle attachment, add your butter, sugar, and brown sugar. Whip until fluffy and lighter in color (about 3 minutes).
Add your eggs and vanilla and mix until fully combined. Scrape down the sides and bottom of your bowl.
Add your flour mixture and mix until just combined.
Add in your oatmeal, coconut, and corn flakes and mix until just combined.
Using a cookie scoop, or a spoon just larger that a tablespoon, Drop your dough onto your cookie sheet about 2" apart and bake in your preheated oven for 10-12 minutes. Edges should be set, but the center will look just slightly underdone. Let the cookies rest on the cookie sheet for at least 5 minutes and then remove to a wire rack to cool.
Store in a Tupperware container or a large Ziploc bag for up to a week.