Spread (about 2 tablespoons) peanut butter over 1 slice sandwich bread. Spread jam or drizzle honey or maple syrup over peanut butter. Top with 4 slices banana, overlapping slightly. (I halve banana crosswise and slice half lengthwise into thin slices that cover bread thinly and evenly.) Top with 1 slice bread. Cut out shapes using sandwich or cookie cutters or trim off crusts and cut sandwich into 2 rectangular bars, 4 squares or 4 small circles. Repeat for second sandwich.
Thinly spread edges of cut sandwiches with peanut butter. Pour 1/2 cup sunflower seeds or chopped nuts on a plate; dip edges in seeds or nuts to coat.
Pack a single-serve yogurt with granola packed into lid alongside.