Preheat oven to 375℉.
Rinse salmon and pat dry. Place salmon on a lined baking sheet. Season with salt and pepper to taste. Place salmon on a parchment-lined quarter sheet baking pan.
In a small bowl, combine garlic, olive oil, mustard, lemon juice, and honey. Spread ¾ of the mixture evenly over the salmon.
Add pistachios to the remaining mixture and stir to combine. Spoon the pistachio mixture on top of the salmon and press lightly into salmon using the back of a spoon.
Bake for 15-20 minutes until salmon is flaky. Remove from oven and let rest for 5 minutes before serving.