Cut the potatoes into chip shapes as he likes. (If your husband will eat them, use sweet potatoes or yams instead of white potatoes to become more primal.) Toss the potatoes with olive oil, or melted lard, or melted chicken fat, or melted duck fat, or melted suet, or melted tallow (basically, use any primal friendly fat; if it's one that is solid at room temperature, heat it enough to turn it to liquid so you can coat the potatoes).
Bake it on a cookie sheet in a hot oven (425º F; 220º C). Stir them around/turn them over (depending on the shape you've cut them into) after about 15 minutes. Bake for a total of about 25-30 minutes, or until crispy.