Place the spaghetti squash in the microwave for 5 minutes to soften. Mix together ground meat, egg, Italian seasoning, almond flour, salt, and pepper for the meatballs.
Pour marinara sauce into the crockpot. Cut the squash in half, scoop out the seeds, and place face-down in the sauce.
Roll meat into meatballs and arrange around the squash in the crockpot.
Cook on low for 6 hours or on high for 3 hours. Once done, scrape the squash into strands and serve with the meatballs and sauce.