I tested this recipe out with two variations: one is sugar free and high in protein and the other is sweetened with pure maple syrup. To make the sugar-free high-protein overnight oats recipe, just add vanilla protein powder sweetened with stevia into the oats and milk. I like whey protein, but if you prefer another source use that instead. If you avoid non-nutritive sweeteners or protein powder, then you can still make this recipe by simply using pure maple syrup instead of the protein powder.