Grease a 9x13-inch baking dish or line with parchment paper.
Spread the coconut in a dry skillet over medium heat. Cook for 2–3 minutes, stirring frequently, until lightly golden. Remove from heat.
In a large pot, melt the butter over medium heat. Continue cooking until it begins to turn golden brown and smells nutty, about 3–4 minutes.
Stir in the honey, marshmallows, salt, and vanilla extract. Cook until completely melted and smooth.
Remove from heat and immediately stir in the Golden Grahams cereal and toasted coconut until evenly coated.
Fold in the white chocolate chips, stirring gently.
Sprinkle the flaky sea salt and mini chocolate chips over the top.
Allow bars to cool for at least 1 hour before slicing into squares.