One highly rated frozen peach pie filling recipe is Paula Deen's at Food Network, which uses fresh peaches, fruit preservative, sugar, tapioca and lemon juice. Another recipe, available at the Penn State website, uses peaches, sugar, Thermflo, cinnamon, nutmeg and the juice and peel of a lemon.
To make Paula Deen's recipe, peel the peaches after blanching them in boiling water, then slice and sprinkle with fruit preservative and sugar. The rest of the ingredients can then be stirred in before the filling is frozen solid.
The Penn State recipe likewise combines peeled peaches with sugar and spices, as well as Thermflo. After letting the mixture stand, stir in the lemon juice and peel and cook until thick before freezing.