Place the bread on a flat surface and spread the mayonnaise or butter thinly, just enough to keep the bread moist.
Place the deli meat and cheese centered and inside the bread crust of one slice of bread. Close the sandwich.
Place the sandwich cutter on top of the sandwich and gently press down until you feel the board. Slowly jiggle to pierce through the bread, lift the cutter, and remove the outer crusts.
With your hands, gently push the shaped sandwich away from the sandwich cutter on the board.
Pack the sandwich inside its own lunch box compartment, along with any sides like fruit and veggies in separate compartments.
Close the lunch container and refrigerate or pack it into a lunch bag with an ice pack.
Notes
Nutrition information is calculated without veggies and fruits.