Set solar oven out to preheat.
Put pasta into your pot, and cover with water. Just enough to cover the pasta. Cover pot and put into the solar oven. Cook for 8-10 minutes (until pasta is just a little soft, but not done). Remove pot, drain pasta, and set aside.
In a large bowl, mix ricotta with the egg, basil, salt, pepper, and half the grated parmesan.
Using the same pot you used to parboil the pasta, cover bottom of pot with a layer of marinara sauce (about ¼ of your sauce).
Layer ⅓ of your pasta evenly on top of sauce. Try to avoid having any pasta touch the side of the pot.
Dollop 5 scoops of the ricotta mixture on top of the pasta, evenly spaced (about ⅓ of your mix)
Top with a layer of mozzarella cheese (about ¼ of your cheese)
Repeat steps 4-7 two more times.
End with a layer of sauce, mozzarella, and then the rest of your parmesan cheese.
Cook for about 3 hours. Your will know it is done when the glass door of your Sun Oven has condensation on it.
Optional: Serve with additional fresh grated parmesan on top.