01 - 
                Spread a thin layer of mayonnaise on one side of each bread slice to ensure a golden, crispy crust when grilled.
              
              
              
                02 - 
                Flip the bread slices and spread peanut butter evenly on the side that will face inward in the sandwich.
              
              
              
                03 - 
                Distribute thin slices of ripe banana evenly over the peanut butter on two of the bread slices.
              
              
              
                04 - 
                Place two bread slices mayo side down on a preheated griddle or non-stick frying pan, then top with the remaining two slices peanut butter side down, so mayo faces outward.
              
              
              
                05 - 
                Cook over medium heat for 2 to 3 minutes until the bread bottoms are golden and crispy, then flip carefully and grill the other side similarly until both sides are golden and filling is warm.