In a large mixing bowl, combine rolled oats, vanilla protein powder, ground flaxseed (or chia seeds), ground cinnamon, and a pinch of salt. Stir these dry ingredients together thoroughly until well mixed, which should take about 1-2 minutes.

Next, add in your choice of nut butter, honey (or maple syrup), and pure vanilla extract to the dry ingredient mixture. Use a spatula or wooden spoon to mix everything together until fully incorporated, ensuring that there are no dry patches.

If the mixture feels too dry and crumbly, gradually add almond milk, one tablespoon at a time, mixing thoroughly after each addition.

With clean hands, scoop out small amounts of the mixture and roll it into 1-inch balls, packing them tightly as you form each one.

Once all the balls are formed, place the tray in the refrigerator to chill for about 15-20 minutes.

After chilling, transfer the protein balls to an airtight container to store them efficiently.