Using Thank You Brand pie filling.
Thank You was ultimately bought by Birds Eye and absorbed into Comstock; Birds Eye is owned by Pinnacle Foods, and it seems to have re-organized its brands to make Comstock part of Duncan Hines. But don’t fret–they still make strawberry.
Here’s an ad for their cherry pie filling from the December 1, 1965 edition of The (Dover, Ohio) Daily Reporter:
From a box sold in River Forest, Illinois.
Frozen Strawberry Dessert
Large can Strawberry Pie Filling
Large can crushed pineapple
1 can Eagle brand condensed milk
1 can chopped nuts
1 large container Cool Whip
Mix in order.
Use Thank You Brand of Strawberry Pie Filling.