Cream together the butter and sugars until light and fluffy. Add the milk, vanilla and eggs and beat well. Stir in cornflake crumbs and oatmeal. Add the flour, baking soda and salt and mix. Stir in the coconut, walnuts, if using, and chocolate chips.
Place tablespoon-sized balls of dough on a lightly greased or lined cookie sheet and bake for 10-12 minutes until lightly golden around the edges.
Notes
Oats: I’ve made these with both rolled oats and quick oats and we slightly prefer the quick oats so that the oats meld together with the cookies a little more but you can use whichever you have on hand.