Final answer:
The abbreviation 'w/' stands for 'with'.
Step-by-step explanation:
The abbreviation 'w/' stands for with in the phrase 'garlic bread w/ cheese'. It is commonly used in informal writing, such as in menus or food descriptions, to indicate an ingredient or topping that is included along with the main item. In this case, 'garlic bread with cheese' means that the garlic bread has cheese as an additional component.