Crack the egg into the mixing bowl and discard the shell.
Add the ricotta cheese and the marinara sauce to the bowl and use the wooden spoon to combine them with the egg.
After thawing the spinach in the microwave, squeeze the water out of the spinach, and add the spinach to the bowl.
Add the spaghetti, basil, oregano, salt, and pepper and stir until well combined, and transfer to the greased pie plate. Sprinkle the mozzarella on top.
Bake for 25 to 30 minutes, until the cheese melts and starts to brown.
Let it cool a bit and transfer each serving onto a plate.