Remove basil from stems.Use a salad spinner to rinse and dry basil. Alternatively, rinse the basil and set aside to dry.
Freeze Dry Basil Leaves:
Lay basil in a single layer on a baking sheet or tray. Freeze for at least 30 minutes, or until each leaf is frozen.Move the leaves into an airtight freezer bag.Pull out the amount of leaves desired as you're ready to use them. If desired, slice or break apart the frozen basil before using.
Freeze Basil in Oil:
Thinly slice the basil.
Divide the basil slices into a silicone ice cube tray.Drizzle a little oil over each cube, and then push the leaves into the oil.Freeze until hardened, and then pop the basil cubes out of the tray and move into an airtight freezer bag.
Notes
Recipe amounts approximate. Yield will vary based on how much basil is used.