Melt butter in large pot over medium heat until melted and lightly browned (see note). Reduce heat to low and stir in marshmallows, reserving one cup, and salt. When marshmallows are almost all melted, stir in vanilla extract. Stir until marshmallow mixture is smooth.
Turn off heat and stir in golden grahams, rice cereal and remaining 1 cup marshmallows. Stir until cereals are evenly coated. Press rice krispy into a lightly greased 9 X 13 pan. Let cool before cutting.
Notes
*Coarsely Crushed Golden Grahams: Place cereal in a ziploc bag and using either a rolling pin or the back of a measuring cup, crush the cereal into large pieces. Brown Butter: To brown butter, cook until fragrant and small specks of light brown appear. Brown butter can quickly turn to burnt butter. This is optional, but adds a richer flavor.