Prepare a baking sheet by lining with parchment paper. In a small bowl, microwave the white chocolate chips at 50 percent power until melted, stirring occasionally, about 1 minute. Let stand for 5 minutes.
In a stand up mixer fitted with the paddle, beat peanut butter, the melted white chocolate, butter, sugar, vanilla, and salt on medium speed, just until combined, about 1 minute. Roll the dough into 1 1/4 inch balls and place on prepared baking sheet. Place in the freezer until firm, about 30 minutes.
In a medium bowl, microwave the semisweet 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. Serve.