Heat panini griddle to medium-high or large non-stick pan over medium heat.
Place the butter on the griddle to melt (do not use all of the butter if doing this in batches).
Spread some soft butter on the outer sides of the bread slices.
Sprinkle both sides of the bread slices with cinnamon-sugar mixture.
Place bread slices on the grill and cook for a few seconds so that the cinnamon sugar adheres to the bread (do not press the panini while doing this).
Flip over and do the same for the opposite side of the bread.
Spread each slice of bread with Nutella, as thick as you like.
Place a layer of sliced bananas on top of the layer of Nutella.
Spread a layer of sliced strawberries on top of the banana slices.
Sprinkle with macadamia nuts.
Grill until the bread is golden brown on each side and the Nutella is melted.
Remove from the grill and sprinkle with the confectioners' (powdered) sugar.
Sprinkle with more chopped macadamia nuts for pizazz.
Serve warm immediately with more strawberries on the side.