I got this from Chocolate Chip Cookie Murder by Joanne Fluke
Crushed corn flakes provide the structural integrity that separates this drop cookie from standard soft-baked varieties. Hand-crushing keeps the flakes large enough to retain pockets of air, preventing a dense, heavy crumb. Stir these flakes in only after the flour is fully incorporated to avoid breaking them down into a powdery dust.
Melted butter requires careful temperature management before eggs enter the bowl. Hot butter will scramble the eggs on contact, ruining the emulsion needed for proper spread. Whisk the melted butter with both sugars first to drop the temperature before adding the eggs, salt, vanilla, and baking soda. Overmixing the flour subsequent to this step develops excessive gluten, yielding a tough rather than crisp perimeter.
Baking at 375 degrees Fahrenheit for 8 to 10 minutes relies on rapid heat transfer to set the edges while keeping the center tender. Pull the pans from the oven the moment the edges turn golden brown. Leaving the cookies on the hot baking sheet for precisely two minutes finishes the internal setting process without burning the bottoms. Transferring them immediately to a wire rack allows air circulation from underneath, locking in the signature crisp texture.