Preheat grill to medium-high heat. Do not follow package ingredients or instructions. Instead, mix brownie mix package with 1/3 cup (75 mL) water, egg and oil until just combine. Fold in chocolate chips. Spread batter evenly in greased 9 in. (23 cm) cast-iron skillet.
Turn off one burner of grill; keeping other burner(s) on medium-high. Place skillet over the turned-off burner. Close lid; cook 15 to 20 min., until slightly crisp around edges and just set in the centre.
Spoon into bowls and top with ice cream, if desired.
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