In a small bowl, mix together mayonnaise, pesto, lemon juice, and salt and pepper.
On a foil-lined baking sheet, place the 8 slices of bread.
Spread an even amount of pesto aioli on each slice. Top 4 of the slices of bread with chicken and sun dried tomatoes, and the other 4 slices with mozzarella cheese.
Broil for 3-5 minutes until the cheese is melted and the chicken is warm.
Assemble sandwiches by placing one slice of bread with cheese one top of a slice of bread with chicken and serve warm.
Notes
We think this sandwich is pretty tasty as is, but you can always swap out ingredients to your liking. Here are a few other ideas:
Swap out the sun dried tomatoes for roasted red peppers
Use fresh mozzarella instead or another type of cheese like provolone
Add a layer of avocados
Add some arugula (it’s too bitter for me, but I know some people love it on their chicken pesto sandwiches)
Swap out the ciabatta bread for focaccia or another fresh-baked favorite