Make a delicious grilled cheese with pesto sandwich.
Heat the skillet to med-low.
Butter one side of each slice of bread.
Place one slice of bread butter side down on the skillet. Top with cheese and pesto, and then top with the second slice of bread (buttered side facing up).
Grill your sandwich slowly, at least 5 minutes each side until browned. Flip and brown the other side too.