Yes, you can freeze French toast! It's a fantastic make ahead breakfast idea! First, allow the slices to cool completely, then arrange them in a single layer on a sheet pan lined with parchment paper. Place them in the freezer for about 2 hours, or until each slice of French toast is frozen. Then, transfer the slices from the baking sheet to a freezer bag or airtight container for freezing for up to 2 months.