In a large mixing bowl, combine the rolled oats, vanilla protein powder, dried blueberries, ground cinnamon, and salt. Stir well to evenly distribute the ingredients.
Add the almond butter, honey, unsweetened applesauce, and vanilla extract to the dry ingredients.
Mix all ingredients thoroughly using a spoon or your hands until a sticky dough forms. If the mixture is too dry, add a little more applesauce, one teaspoon at a time, until it holds together.
Using your hands, roll the mixture into 12 equal-sized balls, about 1 to 1.5 inches in diameter.
Place the protein balls on a baking sheet or plate lined with parchment paper.
Refrigerate the protein balls for at least 30 minutes to firm up before serving.
Store any leftovers in an airtight container in the refrigerator for up to one week.