In a medium saucepan, combine the granulated sugar, butter, and evaporated milk. Cook over medium heat, stirring constantly, until the mixture comes to a boil.
Once boiling, add the miniature marshmallows and chocolate chips. Stir until melted and smooth.
Remove from heat and add the vanilla extract and salt. Mix well.
Fold in the crispy rice cereal until evenly coated.
Pour the mixture into a greased 9x13 inch pan and gently press to spread evenly. Let cool before cutting into squares.
Notes
For an extra touch, top with melted chocolate drizzle or a sprinkle of sea salt.