Roasted Potatoes and Carrots with Ranch Seasoning

Combine olive oil, ranch dressing mix, vinegar, and pepper in a gallon-sized resealable plastic bag. Add potatoes, carrots, and onion, coat with the marinade, squeeze out excess air, and seal the bag. Marinate for at least 15 minutes.

Preheat the oven to 400 degrees F (200 degrees C). Grease a 9x13-inch pan.

Pour vegetables and excess marinade into the prepared baking dish.

Bake in the preheated oven, stirring a few times, until vegetables are tender, about 1 hour. Turn the oven to broil for the last 5 minutes to crisp the vegetables. Remove from the oven, sprinkle with salt, and serve.