In a large mixing bowl, combine the base ingredients: creamy peanut butter, old-fashioned oats, ground flax seeds, and honey. Mix until you achieve a smooth and well-combined texture.

Stir in your chosen mix-ins, such as chocolate chips, chopped nuts, or dried fruits, ensuring everything is evenly distributed.

Cover the bowl with plastic wrap and refrigerate for 15-30 minutes to firm up the mixture.

Remove the mixture from the fridge; slightly dampen your hands and scoop out about a tablespoon of the mixture, rolling it into a ball.

Place the energy bites on a parchment-lined plate or tray and store them in an airtight container for up to a week, or freeze for longer storage.