In a heavy bottomed medium sauce pan, brown the butter over medium heat. (See tips below)
Pour browned butter into a large mixing bowl and cool.
Add brown and white sugars and stir until combined. Add egg, vanilla, flour, baking soda and salt. Stir until well combined.
Spray a mini muffin pan with baking spray.
Roll dough into 1 inch balls and place into prepared mini muffin pan.
Bake for 11 to 13 minutes or until lightly golden browned.
Use the back of a measuring spoon to make indention in each cookie. Place 2 mini marshmallows in each indention. Using a kitchen torch toast the marshmallows.
Top toasted marshmallows with a chocolate kiss.
Remove from pan and set aside to cool.
Notes
BROWNED BUTTER RULES: Stainless pan, medium heat, never leave it. When the foam settles and it smells nutty, pull it, pour it into a cool bowl, and scrape in every toasted bit. Hot butter will scramble your eggs, so let it cool before mixing.