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You can use parchment paper or a silicone baking mat to line your tray, but skip plastic wrap since it's not oven-safe. When it's fully baked, the glitter should be dry and will start to peel away from the baking tray. Your edible glitter should last for months, but may lose some sparkle over time. Be sure to keep away from water and sunlight to prolong its shelf life.
Preheat the oven to 280F (138C) and line a baking tray. Bake the glitter for 10 minutes. Store the edible glitter in an airtight container or jar.