Pour cereal into a shallow pan; bake at 350 degrees for 10 minutes.
Transfer to a bowl lightly coated with non-stick vegetable spray; set aside. Meanwhile, in a saucepan over low heat, combine chocolate and marshmallows; cook and stir until melted.
Add corn syrup; stir well.
Pour chocolate mixture over cereal; stir to coat cereal evenly. Divide mixture into 8 portions; shape each into a cone.
Add chocolate chips to the top of a double boiler over boiling water; melt chocolate, stirring occasionally. Dip cones into melted chocolate, turning to coat.