Place your griddle on medium/low heat. This is important because you don't want to burn the toast and want to give time for the peanut butter and jelly to melt properly.
Butter one side of each of your two slices of white bread. I prefer white bread with peanut butter and jellys but you can use any type.
Add your desired jelly and peanut butter to each slice of bread (non-buttered side) and place the two pieces together. I highly recommend leaving margin for the jelly and peanut butter to spread and is melts. Otherwise it will overflow out the sides of the bread.
Set your peanut butter in the jelly in the center of the griddle. Let cook over medium/low heat. Don't let it get too hot as you want to see the insides melt and the outside of the bread look golden brown.
Once cooked, take off pan and place on plate. Cut in half and serve.