In a large mixing bowl, combine the rolled oats, pumpkin puree, almond butter, maple syrup, ground flaxseed, pumpkin pie spice, cinnamon, and salt.
Stir the mixture thoroughly with a spatula until all ingredients are evenly incorporated and a sticky dough forms.
Cover the bowl and refrigerate the mixture for 10 to 15 minutes to allow the oats to hydrate and the dough to firm up for easier rolling.
Using a small cookie scoop or a tablespoon, portion out the mixture into approximately 1-inch rounds.
Roll each portion between your palms to form a smooth ball.
Arrange the energy balls on a plate or baking sheet.
Store in an airtight container in the refrigerator for up to 7 days or in the freezer for up to 3 months.