01 -
Preheat the oven to 350°F (175°C).
02 -
Grease a 2-quart baking dish to prevent sticking.
03 -
In a large bowl, beat the egg.
04 -
Add the sour cream, parmesan cheese, and garlic powder to the beaten egg.
05 -
Add the cooked spaghetti, Monterey Jack cheese, spinach, and half of the fried onions to the creamy mixture. Stir until evenly combined.
06 -
Pour the spaghetti mixture into the prepared baking dish, spreading it evenly.
07 -
Bake the spaghetti mixture, covered, for 30 minutes until heated through.
08 -
Sprinkle the remaining fried onions over the top of the baked dish.
09 -
Bake uncovered for an additional 5 minutes, or until the onions are golden-brown.
10 -
Remove from the oven and serve immediately while hot.