In a large mixing bowl, combine the whey protein powder, oats, poppy seeds, Truvia, and freshly grated lemon zest. Stir thoroughly for about 1-2 minutes.

Add the fresh lemon juice to the dry mixture, followed by a small splash of water. Mix until fully incorporated and slightly sticky, about 2-3 minutes. Adjust with more water to achieve moist consistency.

Shape the mixture into small balls, about the size of a tablespoon. Form around 28 balls, rolling each one to achieve a smooth exterior.

Place the protein balls in a Tupperware container in a single layer, cover, and refrigerate for at least 30 minutes.