Step 1

Preheat oven to 400 degrees. Spray a rimmed baking sheet with non-stick spray.

Step 2

Cut the spaghetti squash in half length-wise. Scoop out the seeds and discard. Drizzle the inside of the squash with olive oil and sprinkle with salt.

Step 3

Place spaghetti squash flesh side down on the prepared baking sheet at bake for 1 hour or until fork tender.

Step 4

Use a fork to scrape out long strands of squash, scraping across the width of the squash.

Step 5

Brown the ground beef over medium heat in a large skillet.

Step 6

Drain the grease and add the marinara to the pan. Cook for 5 minutes over low heat to heat through.

Step 7

Add the cream cheese, sour cream, and parsley to a small mixing bowl and stir well to combine.

Step 8

Preheat oven to 350 degrees. Spray a 9x13 baking dish with non-stick spray.

Step 9

Place half of the spaghetti squash in the prepared baking dish.

Step 10

Top the squash with half of the meat sauce and all of the cream cheese mixture.

Step 11

Add the remaining spaghetti squash followed by the remaining meat sauce.

Step 12

Sprinkle on the grated mozzarella.

Step 13

Bake for 20 minutes or until cheese is melted and casserole is hot.

Step 14

Serve immediately.