Chicken Caprese Grilled Cheese

0 Season the chicken with salt and pepper. Cook in a skillet over medium-high heat for 3 to 4 minutes per side, or until cooked through. Remove from the pan and let rest.
1 Mix the mayonnaise and pesto together in a small bowl.
2 Lightly salt the tomato slices.
3 Butter the outside of each slice of sourdough. Spread the pesto mayo on the inside of each slice.
4 Layer mozzarella, chicken, tomatoes, and more mozzarella between the slices of bread.
5 Melt a little butter in a skillet over medium heat. Cook the sandwich for 3 to 4 minutes per side until golden brown.
6 Add about 1 teaspoon of water to the edge of the pan, immediately cover with a lid, and steam for 30 to 60 seconds until the cheese is fully melted.
7 Let the sandwich rest for 1 minute before slicing and serving warm.