Combine the wet ingredients: Add the pumpkin puree, nut butter, and maple syrup to a medium mixing bowl. Stir until smooth and well combined.
Add the dry ingredients: Add the rolled oats and pumpkin pie spice to the bowl. Stir thoroughly until the oats are evenly coated and the mixture becomes thick.
Add optional ingredients: If using, stir in the mini chocolate chips and chopped pecans until evenly distributed.
Chill the mixture: Cover the bowl and refrigerate for about 20–30 minutes. Chilling helps the oats absorb moisture and makes the mixture easier to shape.
Form the energy bites: Scoop out small portions of the chilled mixture and roll them between your hands to form round bites. Aim for approximately 12 evenly sized bites.
Chill and serve: Place the finished energy bites in an airtight container and refrigerate until firm. Serve chilled or slightly softened.