Grease an aluminum 1/3 buffet pan with olive oil. Ladle 1/3 of the meat sauce on bottom. Place 2 lasagna noodles over sauce. Top with 1/2 of the ricotta mixture. Cover with two more lasagna noodles. Ladle another 1/3 of the meat sauce over the noodles. Top with two more lasagna noodles, then the remaining ricotta mixture. Top with the last two lasagna noodles, then the remaining meat sauce. Sprinkle with 1/2 cup mozzarella cheese, 1T of parmesan cheese, and oregano. Place in pre-heated 350F oven, and bake for 45-55 minutes.