Melt chocolate according to package directions. Pour half of melted chocolate onto a parchment lined baking sheet. Using a spatula, spread chocolate to create a large chocolate slab. Place in freezer for 10 minutes to solidify.
Mix together peanut butter and vanilla then stir in powdered sugar until smooth and creamy.
Spread peanut butter mixture over chilled chocolate slab to cover entirely.
Pour remaining melted chocolate over top of peanut butter layer. Carefully spread to edges to completely cover peanut butter.
Return to freezer for 5-10 minutes to set top layer of chocolate. Cut Bark into desired sized pieces and enjoy.
Store in an air tight container. No need to refrigerate unless in a warm climate.