In a large bowl, beat together flour, salt, butter, peanut butter, sugars, milk, and vanilla until smooth and combined.

Using a small cookie scoop, portion cookie dough onto the bottom of 10 pecan sandies cookies. {This is about the same as one heaping tablespoons of cookie dough.} Top the cookie dough with a second cookie, bottom side facing the dough. Gently press down until the cookie dough reaches the edge of the cookies. Repeat with remaining cookies.

In a microwave safe bowl, heat white chocolate chips for 1 minute in the microwave. Stir. Heat for another minute. Stir. Continue to heat for 30 seconds at a time, stirring between each interval, until chocolate is melted and smooth.

Dip one half of each cookie sandwich in the melted white chocolate. Place on a Sil-Pat or parchment paper lined baking sheet. Repeat with remaining cookie sandwiches. Reheat white chocolate as needed if it becomes stiff.

Place cookie sandwiches in the fridge until white chocolate sets.