Quick and easy blueberry pie filling recipe that's made with only 5 ingredients: blueberries, sugar, vanilla, lemon, cornstarch. it can be used as topping or filling in many desserts. for the longest time, i used to be intimidated by making homemade blueberry pie filling or any fillings, whatsoever. however, after a bit of practice and my mom guiding me along, i really enjoy making pie fillings from scratch now. they taste so much better than canned fillings and you can adjust the flavors and extracts, based on your preference. they also always have a wonderful fresh flavor and aroma that's.