Preheat your oven to 350°F (175°C) for even baking.
In a large mixing bowl, cream together the unsalted butter, granulated sugar, and brown sugar until light and fluffy.
Add the vegetable oil, egg, and vanilla extract, mixing until fully incorporated.
In a separate bowl, whisk together the all-purpose flour, baking soda, salt, and quick cooking oats. Gradually incorporate into the wet mixture.
Fold in the sweetened shredded coconut, crushed cornflakes, and chopped nuts.
Scoop dough onto prepared baking sheets, leaving space for spreading. Bake for 10-12 minutes until edges are golden.
Let cookies cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.