They're calling it the "Naked Breakfast Taco" and it features a shell that's literally a folded fried egg that can be filled with potato bites, sausage crumbles or bacon, nacho cheese sauce, and shredded cheddar. As long as you forego the potato bites, it should make for a pretty good option for a low-carb diet.
For those who aren't ready to go "naked" there's also a "dressed" version that covers up the egg with a warm Gordita flatbread.
During the test, both Naked and Dressed version of the breakfast taco will sell for $1.99 a piece. You can also get them in a combo that throws in coffee or a medium fountain drink plus two Cinnabon Delights or a hash brown patty for $3.99.
First photo via Taco Bell; second and third photo by Brand Eating.