If needed, melt the unsalted butter (or use the already melted butter) and, if your unsweetened peanut butter is very cold, warm it in the microwave in 5–10 second bursts until soft but not hot. The wet ingredients should be slightly warmer than room temperature so they mix easily.
In a mixing bowl, combine the unsweetened peanut butter, melted unsalted butter, confectioners sugar-free sweetener, and ¼ tsp sea salt. Stir with a spatula or use an electric mixer on low until smooth and uniform.
Add the 1 cup super fine almond flour in two additions, stirring and scraping the bowl after each addition until a cohesive dough forms and there are no dry pockets of flour.
If using, fold in ⅓ cup sugar-free chocolate chips until evenly distributed.
Cover the dough and refrigerate until it firms up, about 1 to 2 hours.
After chilling, eat the dough as is or form into little bites. Store any leftovers in a sealed container or bag in the refrigerator or freezer.