Which product is considered a breakfast staple at McDonald's?

The sausage biscuit is considered a breakfast staple at McDonald's because it is one of the core items offered on the breakfast menu. McDonald’s breakfast offerings are well-known and widely recognized, and the sausage biscuit specifically combines flavorful sausage patties with a soft biscuit, making it a popular choice among customers looking for a hearty and satisfying breakfast option.

In contrast, a garden salad is typically associated with lunch or dinner options rather than breakfast. The Big Tasty is primarily a lunch or dinner product, known for its larger size and robust flavors, while the Happy Meal, although popular among children, is not specifically categorized as a breakfast item. Thus, the sausage biscuit stands out as a definitive breakfast food within McDonald's menu offerings.