Mix Ingredients: In a medium bowl, combine rolled oats, pumpkin puree, peanut butter, honey, pumpkin pie spice, cinnamon, and ground flaxseed. Stir until well combined.
Add Chocolate Chips: Fold in the mini chocolate chips (if using) and mix thoroughly.
Form into Bites: Using your hands or a spoon, form the mixture into 1-inch balls.
Chill: Place the bites on a lined baking sheet and refrigerate for at least 30 minutes to firm up.
Serve: Enjoy straight from the fridge or keep stored in an airtight container for up to a week.