Creating the Best Pesto Grilled Cheese is quite simple when you follow these easy-to-understand steps:

1. Prepare Your Ingredients: Gather all ingredients and set them out for easy access.
2. Spread the Pesto: Take one slice of bread and spread a generous tablespoon of pesto on one side.
3. Add Cheese: Place a slice of cheese on top of the pesto-covered side.
4. Optional Additions: If using, layer sliced tomatoes or spinach over the cheese.
5. Top with Second Slice: Spread pesto on one side of the second slice of bread, then place it on top of the cheese and toppings, pesto side down.
6. Heat the Pan: In a skillet over medium heat, melt half a tablespoon of butter.
7. Grill Sandwich: Once the butter is bubbling, add the sandwich to the skillet. Grill for 3-4 minutes until the bread is golden brown.
8. Flip the Sandwich: Carefully flip the sandwich using a spatula. Add the remaining butter to the pan if needed.
9. Cook Second Side: Grill the second side for another 3-4 minutes until it’s perfectly crispy and the cheese is melted.
10. Serve Hot: Remove from the skillet and let it cool slightly before slicing in half for serving.

With these straightforward steps, you’ll be on your way to enjoying this incredible sandwich in no time!