
Mix the mayonnaise and sriracha in a bowl together.
On each of 4 slices of bread (the non-olive oil coated side), spread with mayo/sriracha sauce and then layer 1 slice of Havarti cheese, 2 tomato slices, a scattering of basil leaves, and 1 slice of Mozzarella cheese. Place the remaining bread slices on top of each (with the olive oil side facing out).