Preheat oven to 350 F. Grease an 8-inch pan, or line with parchment. Gently heat nut butter if not already stir-able, then stir in the applesauce and vanilla extract. In a separate bowl, stir baking soda, salt, flour, sugar, and chocolate chips. Pour the dry ingredients into the wet and keep stirring—it will seem very dry at first, so you’ll need to break up the nut butter and stop occasionally to scrape it off your spoon. If needed, slowly add up to 2 tbsp milk of choice as you stir. Don’t add more milk; it will eventually get gooey like cookie dough. Transfer the batter to the prepared pan. Smooth down evenly. (I press a second sheet of parchment on top to smooth, then remove this sheet.) Press some chocolate chips into the top if desired. Bake 10 minutes. When you take the peanut butter bars out, the top will look set but they will still be very undercooked underneath. This is okay! Leave them to cool for at least 20 minutes, during which time they will firm up. (They also firm up even more overnight.)View Nutrition Facts