Preheat oven to 350°F. Prepare 2 baking sheeta with parchment. In a medium bowl, Whisk together the flour and baking powder until combined. Set aside.

In a stand mixer, add the butter, SunButter, brown sugar and vanilla. Beat on medium-high until combined and fluffy, about 4 minutes. Next, add the egg to stand mixer, then beat again on medium-high until well-incorporated and fluffy.

Pour the dry ingredients into the stand mixer, then beat on low until just combined and smooth. Use a small cookie scoop to scoop out portions, then roll each scoop into a ball and place onto prepared baking sheets. Use a fork to create a criss-cross pattern and flatten each cookie.

Bake the cookies (12 per sheet) for 10 minute, then allow the cookies to cool before dipping in chocolate. Dip the cooled cookies into melted chocolate, then allow the chocolate to harden at room temperature or in the fridge for 10 minutes.