Preheat the oven to 350℉. Grease a 9x13-inch baking dish.
Pour both cans of peaches and syrup into the baking dish. Stir in brown sugar, cornstarch, and cinnamon until fully combined.
Open cinnamon rolls and set aside the icing. Cut each roll into quarters and scatter evenly over the peach mixture.
Bake 40-45 minutes, or until cinnamon rolls are golden brown and cooked through in the center. Cover lightly with foil if the top starts to get too brown.
Let rest for 15 minutes to allow the peach filling to thicken. Drizzle reserved icing over the top before serving.
Notes
Keep leftovers in an airtight container in the refrigerator for up to 4 days.