In the bowl of an electric mixer fitted with the paddle attachment, beat pumpkin puree, peanut butter and eggs on medium-high until well combined, about 1-2 minutes. Gradually add 2 1/2 cups flour at low speed, beating just until incorporated. Add an additional 1/4 cup flour at a time just until the dough is no longer sticky.
Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper or a silicone baking mat; set aside.