Line a large baking sheet with parchment paper and set aside.
In a medium mixing bowl, combine the old-fashioned rolled oats, creamy peanut butter, honey, ground flaxseed, chia seeds, mini chocolate chips, vanilla extract, and a pinch of fine sea salt.
Stir the mixture with a wooden spoon or spatula until all ingredients are thoroughly combined and a thick, sticky dough forms.
Use a 1-tablespoon cookie scoop or your hands to portion the mixture, rolling each portion firmly between your palms to form a smooth, compact 1-inch ball.
Place each finished ball on the prepared baking sheet, repeating until all the mixture is used.
Transfer the baking sheet to the refrigerator for at least 30 minutes to allow the balls to firm up and set completely before serving or storing.