Preheat oven to 400 degrees F. Line a baking sheet with aluminum foil and lightly spray with non-stick cooking spray; set aside.
Add olive oil to a gallon-sized resealable bag.
Add carrots to the bag, seal and shake until all carrots are coated with oil.
Sprinkle Italian dressing mix in the bag, seal and shake until carrots are evenly coated.
Spread carrots on prepared baking sheet in a single layer.
Cook for 25-30 minutes (or until carrots are soft), stirring halfway through.
Notes
Make sure to spread the carrots out in a single layer on the baking sheet – if you have overlap, that will cause the carrots to steam instead of roast. Both ways are delicious, but I prefer them to be roasted