1. Preheat oven to 350°F. Cut squash lengthwise in half; remove and discard seeds. Place squash, cut-side down, in baking dish. Bake about 1 hour or until tender. Cool slightly. Scrape pulp out of shells with fork into strands; set aside.
2. Place steak in center of grid over medium, ash-covered coals; Grill steak, covered, 11 to 15 minutes (over medium heat on preheated gas grill, 13 to 16 minutes) for medium rare (145°F) to medium (160°F) doneness, turning occasionally. Let stand 5 minutes. Carve steak across the grain into thin slices.
3. Meanwhile, combine edamame, broth, butter, salt and garlic powder in a 12-inch nonstick skillet; bring to a boil. Reduce heat and simmer until edamame are heated through. Add squash and toss to coat strands. Cook just until squash is heated through. Remove from heat; add Parmesan cheese and basil, tossing until squash is coated.
4. Divide squash mixture evenly among 4 plates. Arrange steak slices on top of squash mixture.
Test Kitchen Tips If squash is too tough to cut in half, puncture it with the point of a sharp knife about five times then microwave 3 minutes to soften.
Spaghetti squash can be cooked in a microwave oven. Place squash halves, cut-sides down, in a microwave-safe dish. Add 1/4 cup water, cover with vented plastic wrap and cook on HIGH, 10 to 12 minutes, or until tender.