Preheat oven to 350 degrees.Spread pecans out on a large rimmed baking sheet. Bake for 8 minutes, stirring halfway through.
Line a 15x10-inch jelly roll pan with wax paper or parchment paper. Set aside.
Place white melting chocolate and sweetened condensed milk in a large microwave-safe bowl.Microwave at 30-second intervals, stirring after each one, until melted.
Quickly stir in pecans, vanilla, and salt.
Transfer mixture to prepared jelly roll pan. Spread it out into an even thickness. You don't have to spread it all the way to the edges. Leave it a little thicker if you like.
Refrigerate for 1 to 2 hours.
Cut into squares.Can be stored at room temperature.
Notes
Nutritional info is provided as an estimate only and will vary based on brands of products used.