Preheat oven to 350 F. Wash and chop ends of squash and zucchini.
With a mandolin, slice vegetables length-wise. Slices will be uniform and takes no time. Conversely, vegetables may be sliced by hand.
Gently toss the vegetables with oil, salt and pepper.
Wash, then stack the basil leaves, then roll and cut into fine ribbons for your chiffonade cuts.
Line a sheet pan with parchment paper.
Stack in the following order: Squash, zucchini, gouda, repeat twice, then final layer stack of Squash, zucchini, basil, gouda
Bake at 350 F for approximately 13 minutes, until gouda is just melted.
Let cool for 5 minutes, then sprinkle with pistachios.
Cut in half on the diagonal and serve warm.