Preheat oven to 375 degrees F.
In the bottom of the casserole dish, add a cup of the meat sauce to cover the bottom of the baking dish.
Evenly space 3 lasagna sheets on top on the sauce, horizontal to the long sides of the baking dish.
Spread half of the ricotta cheese mixture evenly over the pasta sheets.
Sprinkle about 1/3 of the parmesan and mozzarella in an even layer on top of the pasta sheets.
Add a thin layer of meat sauce on top of this layer.
Evenly space 2 lasagna sheets in the opposite direction of the previous layer, vertical to the sides of the baking dish.
Spread the rest of the ricotta over this layer, then 1/3 more of the parmesan and mozzarella.
Add a thin layer of meat sauce on top of this second layer.
Evenly space 3 lasagna sheets for the final layer, then cover with the rest of the sauce. If using dry lasagna sheets (and not pre-boiling), ensure there is enough meat sauce to fully cover the dry pasta. Push down on the layers of pasta slightly to be submerged in the sauce.
Cover the layers of lasagna with the remaining grated cheese.
Place the casserole dish on the center rack of the preheated oven.
Bake for 50-60 minutes, or until cheese on top is golden brown.
Let the finished lasagna cool for about 10 minutes before slicing.
Using a chef's knife, cut into squares or rectangles of preferred serving sizes.
Using a spatula, lift each piece carefully onto serving plates.
Enjoy!