Preheat oven to 325 degrees F. Heavily grease cookie sheets or use parchment paper or the non-stick liners. Adjust oven racks to upper and lower-middle positions.
In a large bowl, beat egg whites and cream of tartar until stiff peaks form (properly whipped meringue is glossy and smooth, and the consistency of shaving cream). Carefully fold in powdered sugar, shredded coconut, cornflakes cereal, salt, and vanilla extract.
Drop by small teaspoonfuls onto prepared cookie sheets, about 2 inches apart.
Bake 12 to 15 minutes or until light brown. Remove from oven, remove from baking sheets, and let cookies cool on wire racks.
Coconut Cornflake Macaroons Recipe: https://whatscookingamerica.net/cookie/coconutcornflake.htm