Preheat your oven to 300 degrees Fahrenheit.  

Cut out a piece of aluminum foil and loosely wrap the leftover shrimp in it.

Take a baking sheet, arrange the wrapped shrimp in a single layer on top of it, then put the baking sheet in your preheated oven.

Let the shrimp bake for about 15 minutes. Keep an eye on the shrimp so as not to overcook it.

Remove the tray from the oven and serve them hot.