Preheat oven to 425 degrees Fahrenheit. Line a baking sheet with foil paper. Cut the butternut squash lengthwise and remove the seeds. Cut the butternut squash in cubes. Drizzle with olive oil, salt, and pepper. Bake for 30-40 minutes. Tip: I pierce the butternut squash with a form and microwave for about 5 minutes so it softens slightly and is easier to cut.
Meantime bring salted water to a boil and cook the pasta al dente.
If you’re using fresh lobster, cook by brining water to a boil as well. Poach the lobster for 2-3 minutes. Crack the shell and remove the flesh. Give the lobster a rough chop and set aside.
When the squash is cooked, transfer to a food processor with the Greek yogurt, nut meg, salt, and pepper. Add the stock until you get a thick consistency (thicker than soup – similar to a rough). You may need less or more than recommended measurement.
Transfer the butternut squash mixture to a large pan on low heat. Add the pasta, lobster and cheese. Mix well and season with more salt and pepper if needed.
Transfer the mac and cheese to individual ramekins or a large baking dish.
Sprinkle the reserved cheese and bread crumbs. Bake at 350 for 15 minutes.