Make Cookie Dough Base:
In a mixing bowl, cream together butter, granulated sugar, and brown sugar until smooth. Stir in milk and vanilla. Add flour and salt, mixing until dough forms.

Add M&M’s:
Fold in mini M&M’s gently. Set aside.

Melt Fudge Base:
In a saucepan over low heat, melt white chocolate chips and sweetened condensed milk, stirring constantly until smooth and melted.

Combine & Set:
Remove from heat and quickly stir in the cookie dough mixture. Mix until well combined.

Chill:
Pour into a lined 8×8-inch pan and smooth the top. Sprinkle extra M&M’s on top if desired. Refrigerate for 2–3 hours or until firm.

Serve:
Cut into squares and enjoy!