Preheat oven to 400° F and spray baking sheet with non-stick cooking spray.
Chop asparagus into bite sized pieces then toss with 1 Tbsp olive oil and salt and pepper, to taste.
Spread evenly, into single layer, onto prepared baking sheet. Bake at 400° F for 15 minutes.
Remove from oven and let cool completely.
While asparagus is roasting, cook pasta according to package directions, until al dente. Strain and toss in medium bowl with remaining 1 Tbsp. olive oil and allow to cool.
Add sun-dried tomatoes, lemon juice, butter, parsley, Parmesan, green onions, and asparagus. Toss to combine.
Serve immediately at room temperature or refrigerate until cold before serving.