To Freeze: After baking and coating in cinnamon sugar, place the french toast sticks in a single layer on a parchment-lined baking sheet and freeze for 1-2 hours, until firm. Transfer to a freezer-safe container and store for up to 3-4 months. To reheat, microwave the sticks for 1 minute on one side, flip, and microwave for an additional minute. Adjust the time as needed depending on your microwave's power.