Place the remaining 6 slices of bread on top, buttered side up.
Bake in the oven for 6-8 minutes, then flip the sandwiches and bake about 6 minutes more, until the sandwiches are golden brown and crispy. (Alternatively, you can grill them on the stove top on a griddle or in a skillet).
Video
Notes
Feel free to use different cheese combinations like mozzarella, cheddar, or gruyere.
If you use larger shrimp, be sure to adjust the cooking time to ensure proper cooking.