Cut spaghetti squash in half lengthwise, use a spoon to scoop out the seeds, and brush the cut sides with oil. Add salt and pepper, to taste. Place on a baking tray cut sides down. Bake 30-35 minutes, or until tender.
Add marinara sauce, stirring to combine. Reduce heat to a simmer, stirring occasionally.
Meanwhile, combine ricotta, egg, parmesan, mozzarella, oregano, basil, thyme, and oregano in a small bowl.
Remove the skillet with the meat sauce from heat.
When the squash is finished cooking, use oven mitts to turn squash face-up on the baking sheet. Spoon the herb and cheese mixture into the bottom, dividing it equally between the four halves of the squash.
Finally, use a ladle to add the meat sauce, filling the squash. Sprinkle with parmesan and mozzarella.
Bake for an additional 10 to 15 minutes, or until cheese is browning at the edges. Let cool 5-10 minutes before serving. Serve immediately or save some for the next day!