Lay out the slices of bread and spread approximately 1 tablespoon peanut butter on each of 4 slices and approximately 1 teaspoon jelly on each of the other 4 slices. Pair them together to make peanut butter and jelly sandwiches.
Heat canola oil in a deep-fryer to 375 degrees F. Mix flour, cornstarch, and baking powder and add energy drink in a stream while whisking constantly. Dip sandwiches into the batter or ladle batter over them.
Deep-fry until golden brown. Drain on paper toweling. Mix cinnamon and sugar in a bowl and sift onto fried sandwiches while they are still hot. Slice the donut sandwiches into diagonal quarters while still warm, and serve.