Most of my family is Pennsylvania Dutch (not Amish) so some of the most common things are:
cinnamon buns (also called sticky buns) which you can make with or without nuts
rivel soup - tiny dumplings you make from flour & egg, then drop into boiling water or broth (chicken, beef, veg) by rubbing between your hands.
Hootsla - basically bread cubes to which you add a mix of eggs & milk (as you would for scrambled eggs) and then fry
Major family meals were accompanied by "7 sweets and 7 sours" - sweets included baked goods (rolls and pies especially) and sweet relishes, sours included cole slaw and pickles and pickled beets.
Heinz is based in Pittsburgh and Hershey's products are based in Hershey so their products were always featured prominently. Someone else mentioned Quaker Oats. Philly cheese steak is going to be expensive though! Hero or sub sandwiches are called hoagies in PA.
If you want my great grandmother's recipes, message me!