Overnight oats can be sweetened using your favorite sweetener. For a clean, healthier option, I recommend pure maple syrup or honey. Depending on the recipe, 1-3 teaspoons is usually enough of this sweetener.u003cbr/u003eu003cbr/u003eYou can also use coconut sugar, agave, stevia, monk fruit, or any other sweetener. I suggest starting with the smallest amount and then add in more if you need to.