Line a rimmed baking sheet or plate with parchment paper (something that will fit in your freezer). In a small bowl, microwave white chocolate chips at 50 percent power until melted, stirring occasionally, about 1 minute. Let stand for 5 minutes.
In a stand mixer fitted with the paddle attachment, or with an electric hand mixer on medium speed, beat melted white chocolate, powdered sugar, peanut butter, butter, vanilla, and salt until just combined, about 1 minute.
Roll the dough into 1 1/4 inch-balls and place on prepared baking sheet (I like to use a 100# scoop). Place in the freezer until firm, about 30 minutes.
In a medium bowl, microwave the semi-sweet chocolate chips at 50 percent power until melted, stirring occasionally, about 1 1/2 to 2 minutes.
Using a toothpick, dip chilled dough balls into the melted chocolate, leaving the top quarter uncovered. Return the balls to the freezer until the chocolate is set, about 1 hour.