Toast three slices of bread until golden brown and crispy.
Spread mayonnaise on one side of the first piece of toast.
Layer American cheese, ham, two slices of tomato, two leaves of lettuce, and two pieces of bacon on the mayo side.
Spread mayonnaise on both sides of the second piece of toast and place on top of the first layer, mayo side down.
On the exposed mayo side of the second toast, layer Monterey Jack cheese, remaining tomatoes, lettuce, turkey, and bacon.
Spread mayonnaise on one side of the third piece of toast and place on top of the stack, mayo side down.
Secure the sandwich with toothpicks or skewers in four corners.
Slice the sandwich diagonally into quarters, ensuring each piece has a toothpick to hold it together.