There are plenty of Dunkin Donuts stores in walkable places. I have a Dunks across the street from my condo and another one around the corner (and several others several blocks away). (I live in this area, which is VERY walkable: https://www.google.com/maps/@41.8822495,-87.6254941,1122a,35...)

It's true there are also other, superior, options, but that's a bonus!