Preheat the oven to 350°F. Line a baking sheet with parchment paper. In a mixer fitted with the paddle attachment, combine the coconut butter, maple syrup, brown rice syrup, sugar (if using), and vanilla. Mix on low speed to incorporate for about a minute. In a separate bowl, combine all the dry ingredients, except the nuts and seeds, and stir well. Add about half of the dry mixture to the wet mixture. Churn with the mixer to start to incorporate, and then add the remaining dry mixture, as well as the nuts and seeds. Continue to stir on low speed, just until the mixture comes together and forms a dough on the paddle. Scoop spoonfuls (1 1/2 to 2 tablespoons in size; a cookie scoop works very well but isn’t essential), and place on the prepared baking sheet. Bake for 14 minutes, then remove from the oven and let the cookies cool for about a minute on the baking sheet. Transfer to a cooling rack to cool completely.