1. Combine Dry Ingredients: In a large mixing bowl, combine the rolled oats and ground flaxseed meal. Use a spoon or spatula to mix them thoroughly, ensuring the flaxseed is evenly distributed among the oats. This forms the base of your energy balls.

2. Add Wet Ingredients: Pour in the nut butter, honey (or maple syrup), and vanilla extract into the bowl with the dry ingredients.

3. Mix Until Well Combined: Using a sturdy spoon or your hands, mix all the ingredients together. Continue mixing until everything is fully incorporated and a thick, uniform dough forms. It should be sticky enough to hold together when pressed.

4. Stir in Optional Mix-ins: If you’re using mini chocolate chips or shredded coconut, add them to the mixture now. Fold them in gently until they are evenly distributed throughout the dough.

5. Roll into Balls: Take small portions of the mixture (about 1 tablespoon each) and roll them between your palms to form compact, bite-sized balls. Aim for a consistent size so they chill and store evenly.

6. Chill for Firmness: Arrange the rolled energy balls on a plate or baking sheet lined with parchment paper. Place them in the refrigerator for at least 30 minutes. This chilling period is crucial as it allows the ingredients to firm up, making the balls less sticky and more enjoyable to eat.