01 -
Line a square 9x9 baking dish with parchment paper.
02 -
Add the peanut butter and softened butter to the bowl of a stand mixer and beat on medium speed with a paddle attachment until combined thoroughly, scraping down the sides as it blends.
03 -
Add the vanilla extract and blend on low speed. Gradually add the powdered sugar, ensuring not to over-pack the measuring cup. Continue mixing on low speed until a ball forms. The dough should not be too wet; if it is, add more powdered sugar.
04 -
Transfer the peanut butter mixture to the lined pan and press it down with your fingers or the back of a wooden spoon, ensuring it is evenly distributed, especially into the corners.
05 -
In a microwave-safe bowl, add the chocolate chips and coconut oil, if using. Microwave for 30 seconds, stir, and then heat for another 20-30 seconds until melted.
06 -
Pour the melted chocolate mixture over the peanut butter layer and use a spatula to evenly spread the chocolate on top.
07 -
Place the bars in the refrigerator for approximately 2 hours until the chocolate is fully hardened.
08 -
Top with sea salt, if desired.