01 -
Preheat the oven to 350 degrees F.
02 -
Grease a 2-quart baking dish.
03 -
In a large bowl, beat the egg.
04 -
Add the sour cream, parmesan cheese, and garlic powder to the bowl and mix well.
05 -
Add the cooked spaghetti, Monterey Jack cheese, spinach, and 1/2 of the fried onions to the egg mixture. Stir until combined.
06 -
Pour the spaghetti mixture into the prepared baking dish.
07 -
Bake, covered, for about 30 minutes until heated through.
08 -
Top the spaghetti mixture with the remaining fried onions.
09 -
Bake for another 5 minutes, or until the onions are golden-brown.
10 -
Serve hot.