Line a 4x8 inch bread pan with parchment paper, leaving overhang for easy removal. This makes lifting the bars out so much easier when they're set.
Add ½ cup oat flour, ½ cup vanilla protein powder, ⅓ cup pumpkin puree, ¼ cup almond butter, 3 tablespoons maple syrup, 1 tablespoon coconut oil, 1 teaspoon vanilla extract, 1 teaspoon cinnamon, ½ teaspoon pumpkin pie spice, and ¼ teaspoon salt to a food processor. Process until well combined and the mixture holds together when pressed. The dough should be thick enough to roll into a ball without sticking to your hands, though it will be slightly tacky.
If the mixture feels too wet or sticky, add oat flour 1 tablespoon at a time until it reaches the right consistency. If it's too dry, add a bit more pumpkin puree or almond butter.
Transfer the mixture to your prepared pan and press firmly into an even layer using the back of a spoon or your hands.
Refrigerate for at least 2 hours or freeze for 30 minutes until firm. Lift out using the parchment paper overhang and cut into 6 bars.
Melt 3 tablespoons chocolate chips with ½ teaspoon coconut oil in the microwave in 30-second intervals, stirring between each, until smooth. Drizzle over the bars and sprinkle with sea salt if desired.