How Taco Bell Knows Exactly What You Want to Eat at 2 a.m.

Liz Matthews is considered the GOAT of new product ideas, testing hundreds to develop viral hits like Doritos Locos Tacos and Baja Blast

- BY HEATHER HADDON

Liz Matthews, center, and her team try out sauces in the test kitchen.

A TEAM AT TACO BELL has been working, for nearly a decade, to invent a taco shell made entirely of cheese.