using sharp knife, split spaghetti squash in half lengthwise and remove seeds
microwave skin-side down at high power for 12-15 minutes (depending on your microwave)
rotate half way through and cook until tender (insert small knife into squash to test)
sauté garlic and onions in a non-stick pan until they release their fragrance
add the remainder of the veggies and sauté for about 5 minutes at medium heat until the veggies start to release their juices, the onions should not get brown
add tomatoes and stir
simmer at low to medium heat until the excess liquid is evaporated
while the sauce is reducing, you can play with the seasonings until you get something you like
using oven mitts, remove squash from microwave and place on large platter. Keep the mitts on while you take a large fork and flake the squash into pasta-like strands (Use a lengthwise motion--if you have never seen this before you will be amazed how pasta-like this becomes)