This from the early years of Soda Bars in the Five n Dimes: Take a "personal" bag of Fritos, slit the front open making a bowl of sorts, add hot chili of your choice, lots of finely grated cheese, some hot sauce and hopefully some sour cream.
I remember the times at my grandmothers work place at Wackers (yea, Wackers) soon to be another name., then further to Woolworths. She made the wonderful Frito Pie that I remember fondly to this day. That, and the Minah bird that said "Shop Wackers!!!" Fond memories.