Preheat the ovenn to 350 degrees F.
Line a cookie sheet with parchament paper.
Add the tahini, oat milk, agave, vanilla and coconut sugar to a saucepan, whisking over low heat until the mixture reaches a creamy, sticky, caramel like texture. Set aside to cool for five minutes.
While the caramel mixture is cooling, combine all dry ingredients, including the walnuts (if using) into a bowl and mix well.
Add the wet ingrdients to the dry and mix unitl a batter is formed.
Use a 1/4 cup to scoop the batter onto the parchament paper, leaving some room for the cookies to bake. Flatten each cookie with a spatula.
Bake the cookies for 12-15 minutes, checking them at 12 minutes and frequently after 12 minutes to see if they are done. They are done when the bottom is browned and the edges are a little brown.
Allow to cool before devouring! Stoe in an air tight container on the counter for up to a week or freeze them to preserve longer.