In a 7 inch by 3 inch Spring Form Pan or 7 by 3 inch oven safe cake pan, layer the ingredients for the lasagna.
Start with a thin layer of marinara sauce.
Break up oven ready lasagna noodles to fit to cover the bottom of the baking pan.
Top with half the ricotta cheese mixture.
Sprinkle with half the meat and onion mixture.
Cover the meat mixture with marinara sauce.
Add another layer of lasagna noodles, breaking to fit in a single layer over the marinara sauce.
Top with remaining ricotta cheese mixture.
Sprinkle with remaining meat mixture.
Top with another layer of marinara sauce.
Add final layer of lasagna noodles, breaking to fit again.
Top with generous layer or tomato sauce.
Sprinkle generously with shredded Mozzarella Cheese.