Preheat oven to 425 degrees F.
Toss butternut squash with 2 tablespoons of olive oil and salt.
Bake on baking sheet for 25-30 minutes, until cubes are soft and cooked through.
Meanwhile, in medium saucepan, heat remaining tablespoon of olive oil over medium heat.
Add onion and sauté until translucent, about 5-7 minutes.
Add garlic and cook for 1 minute.
In large blender, combine all but 1 cup of the butternut squash, sautéed onion, and vegetable broth.
Blend until pureed. Taste and add salt to your liking.
Toss butternut squash sauce with uncooked tortellini.
Spray 9x13" baking dish with cooking spray.
Cover bottom of baking dish with half of the tortellini mixture, then top with half of the cheese.
Evenly sprinkle remaining 1 cup of butternut squash over the cheese.
Repeat with remaining tortellini, scraping all of remaining sauce on top.
Top with remaining cheese.
Bake in preheated oven for 20-25 minutes, until cheese is melted and golden brown.
After 25 minutes I turned my broiler on for 1 minute to get cheese nice and golden.
Serve and enjoy!