Combine the rolled oats, peanut butter, flaxseed meal, chocolate chips, honey, and vanilla extract in a large mixing bowl.
Stir the mixture thoroughly until a uniform, tacky dough forms.
Place the bowl in the refrigerator for 30 minutes to chill, which improves the structural integrity for rolling.
Using a portion scoop or tablespoon, measure out roughly 25-30 grams of the mixture.
Roll the portioned mixture between the palms of your hands to form a spherical shape approximately 1 inch in diameter.
Arrange the balls on a parchment-lined tray and store in an airtight container in the refrigerator.