Which of the following is NOT a sandwich or flatbread combination?

The Italian sausage sandwich is indeed a sandwich choice on the Olive Garden menu, featuring Italian sausage within a bun, typically garnished with various toppings.

In contrast, the Smashed chicken meatball sandwich, Chicken Parmigiana sandwich, and Grilled chicken flatbread all represent sandwich or flatbread combinations rather than standalone items. The term "flatbread" in the last option indicates that it is classified separately from traditional sandwiches, while the other two options are clearly defined as sandwiches featuring chicken and meatball components.

This understanding highlights the distinction between the various types of menu items and their classifications at Olive Garden.