Grilled chicken sandwich with apricot sauce

This is delicious sandwich recipe that I tried a few months ago from www.thepioneerwoman.com. I make mine a little different :-) Hope you enjoy it as much as I do!

Grill chicken breast or use previously cooked ones. Season as you like. 
Combine equal parts apricot preserves, Dijon mustard, and mayonnaise. Add cayenne to taste. 

To assemble, spread apricot sauce on two slices of whole wheat bread. Add chicken breast, baby spinach, and mozzarella cheese.
Drizzle with olive oil and brown on a panini grill.