Preheat oven to 400 degrees.
Prepare two baking sheets with silicone mats or parchment paper.
On one baking sheet making a single layer of broccoli, mushrooms, and leeks.
On the second baking sheet, make a single layer of the remaining vegetables, but separate the butternut squash, as it will be needed for the dressing after roasting.
Sprinkle both pans of vegetables with seasonings.
Roast the pan containing the mushrooms for 17-20 minutes,
Roast the pan containing the sweet potatoes for 30 minutes.
While vegetable roast, prepare the pasta and assemble the other dressing ingredients.
If eating the fall pasta salad warm, plan for the pasta to finish cooking shortly before the vegetables finish roasting.
If choosing the cold option, drain the pasta and run through cold water to cool pasta.
Combine pasta (warm or cold) with roasted vegetables.