Brown the ground beef in the butter. Pour off the
grease, and stir in the garlic, salt, pepper, and tomato
sauce.
Cover, turn the burner to low, and simmer for 20
minutes.
While the meat is simmering, slice the scallions,
including the crisp part of the green, and combine with the cream cheese and sour cream.
Blend well.
In the bottom of a 6-cup casserole, layer
half the spaghetti squash, half the scallion mixture,
and half the tomato-beef mixture; repeat the layers. Top
with the Cheddar, and bake for 20 minutes.