In a large mixing bowl, combine the old-fashioned rolled oats, the zest of one lemon, and a pinch of salt. Stir until evenly mixed.

In another bowl, combine the natural peanut butter, maple syrup, melted coconut oil, fresh lemon juice, and vanilla extract. Whisk until smooth and creamy.

Pour the wet mixture into the bowl of dry ingredients and mix thoroughly until a sticky dough forms.

Using a tablespoon or cookie scoop, form the dough into small cookies and place them on a parchment-lined baking tray.

Refrigerate for at least 30 minutes to allow the cookies to firm up.