Step 3 -In a large bowl, beat the egg.
Step 4 -Add the sour cream, the parmesan cheese, and the garlic powder.
Step 5 -Add the cooked spaghetti, the Monterey Jack cheese, the spinach, and 1/2 of the onions to the egg mixture.
Step 6 -Pour the spaghetti mixture into the prepared baking dish.
Step 7 -Bake, covered, until heated through, for about 30 minutes.
Step 8 -Top the spaghetti mixture with the remaining onions.
Step 9 -Bake until the onions are golden-brown, about 5 minutes.
Step 10 -Serve hot.
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