Preheat oven to 350°F (175°C). Grease or line a 13×9-inch baking pan with parchment paper.
In a bowl, whisk together the flour, pumpkin pie spice, baking soda, and salt. Set aside.
In a separate large bowl, mix the coconut sugar, applesauce, Greek yogurt, melted coconut oil, eggs, and vanilla until smooth. Stir in the pumpkin purée.
Pour the dry ingredient mix into the wet ingredients and stir gently until just combined. A few small lumps are fine — don’t overmix.
Fold in ½ cup chocolate chips. Pour the batter evenly into the prepared pan. Sprinkle a few extra chocolate chips on top if you like.
Bake for 20–25 minutes, until a toothpick inserted into the center comes out clean (a few moist crumbs are okay).
Remove from oven and let cool completely in the pan. Once cool, cut into ~15 bars.