Line a 9x13-inch baking pan with foil and spray with baking spray. Set aside.

In a large pot, on the stovetop over medium-high heat, melt the butter. Once melted, add 7 cups of mini marshmallows into the melted butter. Stir the mixture until the marshmallows are completely melted. Remove the pot from the stove and stir in the white chocolate chips, vanilla extract and salt. Stir in the Rice Krispies and Golden Grahams one cup at a time into the marshmallow mixture. When adding the last cup of cereal, stir in the remaining cup of marshmallows. Gently fold in the milk chocolate chips.

Pour mixture out into prepared pan and sprinkle with milk chocolate chips if desired. Let bars cool and set completely before cutting into desired sized squares.