Mix the pumpkin layer. In a bowl, stir together the pumpkin puree, 1 to 2 tablespoons maple syrup, pumpkin pie spice, cinnamon, vanilla, and a pinch of salt.
Taste and adjust sweetness or spice as you like.
Sweeten the yogurt. In a separate bowl, mix the Greek yogurt with 1 to 2 tablespoons maple syrup and a small pinch of salt. You want it lightly sweet so it balances the spiced pumpkin.
Prep the crunchy layer. Combine granola or crushed graham crackers with chopped nuts if using. If you like, toss with a tiny drizzle of maple for extra flavor.
Layer the parfaits. In 4 small glasses or jars, add a spoonful of the crunchy layer, followed by a layer of yogurt, then pumpkin.
Repeat the layers until you reach the top.
Finish with flair. Add a final sprinkle of granola, a dollop of whipped cream, and an extra dusting of pumpkin pie spice or cinnamon.
Serve now or chill. Enjoy immediately for the best crunch, or chill for up to 2 hours if you prefer a softer, more pie-like texture.