Use a large cup or a large circle cookie cutter to cut the biggest circle you can out of the slice of sandwich bread.
Use the side of the cup or a rolling pin to lightly roll over the bread flattening it slightly (don't press hard you just want it a little flatter than usual).
Spread peanut butter on the bread.
Spread jam on the bread.
Fold up bread into taco shape and top with strawberries and blueberries.
Notes
Feel free to add or substitute any toppings you like!