I know Taco Bell is barely "Mexican" food as it is, but this is pushing it: They're currently testing a new breakfast item called a Grilled Cheese Biscuit that basically looks like a McDonald's Sausage Biscuit with cheese on top.
They've got two versions: A plain buttermilk biscuit with cheddar, mozzarella, and pepper jack cheese melted over top of it, and one that's cut in half with a sausage patty in the middle.
They're testing it at a few locations in Knoxville, Tennessee. It's not clear if and when they plan to release it nationwide.