You sure can! Transfer slices to an airtight container and refrigerate for up to 2 days. Reheat in the microwave, toaster, or in a skillet on the stove. This banana French toast also freezes beautifully. Wrap individual slices in plastic wrap before placing them in a freezer bag, or stack them between layers of parchment paper in an airtight container. Freeze for up to 2 months.