Drizzle the spaghetti squash with oil. Place an even number of tomatoes in each squash. Place 1 piece of Boursin on top. Bake 45 to 55 minutes. Cover with foil if Boursin starts to brown.
The general consensus is to roast oiled and seasoned spaghetti squash halves cut-side down for between 35 and 45 minutes at 400 to 425 degrees Fahrenheit. If you cook the halves for too long ...
This squash can be baked or boiled whole, then cut in half, topped with sauce and eaten as if it were spaghetti, which makes it a useful gluten-free or low-calorie substitution in pasta recipes.