In a medium-sized bowl, whisk together the almond flour, arrowroot, baking powder, baking soda, and sea salt.
In a large bowl, beat the butter and coconut sugar with an electric mixer until fully combined, then add in the cashew butter, eggs, and vanilla, and mix until well incorporated.
Add the flour mixture into the wet mixture 1/2 cup at a time, beating constantly, until fully combined, then stir in the chocolate chips.
Line your slow cooker with parchment paper, then press the dough into the slow cooker in an even layer. Cook on high for two hours, until the edges and top of the cookie are browned and the center is still slightly soft.
Serve immediately with vanilla ice cream, or turn the slow cooker to warm to eat later.