Line an 8×8″ baking pan with parchment paper Set aside.
Melt the butter in a large saucepan over medium heat. Brown the butter, stirring frequently, until it darkens to a golden color and starts to smell nutty (about 3-4 minutes).
Add in the vanilla, pinch of salt, and marshmallows (reserve 1c of marshmallows to the side). Stir together until the marshmallows are partially melted, about 2-4 minutes.
Turn off the heat, and add in the crispy rice cereal, freeze dried strawberries, and crushed cookies. Stir until evenly combined.
Add in the reserved 1 c of marshmallows and stir until they are partially, but not completely melted.
Press the mixture into an even layer in the baking pan.
Optional: Drizzle the melted marshmallow fluff on top.
Cool at room temperature for about one hour. Slice the strawberry shortcake rice krispie treats into bars. Enjoy!