Combine white chocolate chips and dulce de leche in a saucepan.
Heat over low heat, stirring regularly, until the caramel is super soft and the chips are mostly melted.
Remove from heat and stir in pretzels, peanuts, and vanilla.
Pour into prepared pan and refrigerate 2-4 hours till set.
Cut into pieces and enjoy!
Notes
Remove the white chocolate dulce de leche mixture from the heat before the chips are fully melted. They will continue to melt once removed from the heat and you do not want to over-heat them.