Mozzarella and Pesto Panini

Instructions

1. Preheat a panini press or skillet over medium heat.
   
2. Spread pesto evenly on the inside of each slice of bread.
   
3. Layer mozzarella (and any optional add-ins) on two slices of bread.
   
4. Top with remaining bread slices, pesto-side down.
   
5. Brush the outside of the bread with butter or olive oil.
   
6. Grill in a panini press for 6–8 minutes, or cook in a skillet, pressing with a spatula and flipping once, until bread is golden and cheese is melted.
   
7. Remove from heat, slice, and serve warm.