Line the Pan – Line your baking dish with parchment paper, leaving a slight overhang for easy lifting.
Melt the Mixture – In a saucepan over low heat, melt the butter, 1 cup of mini marshmallows, chocolate chips, and corn syrup. Stir constantly until smooth and fully melted.
Add Vanilla & Salt – Remove from heat and stir in the vanilla extract and pinch of salt.
Mix with Cereal – Pour the melted mixture into a large bowl with the Golden Grahams cereal. Stir until everything is evenly coated.
Fold in Extra Marshmallows – Gently fold in the remaining 1 cup of mini marshmallows for that gooey texture.
Press into Pan – Transfer the mixture to the lined baking dish. Press it down firmly using a spatula or the back of a spoon.
Chill – Refrigerate the bars for at least 45 minutes to firm up.
Slice & Serve – Once chilled, lift the bars out of the pan and slice into squares.