When serving a medium coffee with extra cream or sugar, what size should be adjusted to?

When serving a medium coffee with extra cream or sugar, it's essential to consider how these additions impact the overall volume of the drink. By moving up to a larger size, such as a large, you accommodate the extra cream or sugar while maintaining the beverage's intended balance and flavor.

If you were to keep it at the medium size after adding these ingredients, it could become overly full, leading to spills or an unbalanced taste where the added ingredients overpower the coffee itself. By adjusting to a larger size, the drink remains manageable, and the customer can enjoy their coffee without compromise. This adjustment also aligns with the standard practice of ensuring customer satisfaction in beverage preparation at Dunkin Donuts.