Preheat oven to 350°F | 180°F.
Start by putting 1 thin layer of meat sauce on the bottom of a 9 x 13 baking dish.
Cover with 3 strips of Lasagna or 1 sheet. Trim to fit if needed.
Cover pasta layer with meat sauce
Cover meat with 1 cup of white sauce, several scoops of Ricotta cheese (if using). Blend cheese layer together lightly to edges with a spatula. Just smear it all together in little swirls. Add in about 1/3 of your mozzarella cheese. Make sure you leave at least half of the remaining mozzarella cheese for the very top layer. This is what will make it nice and bubbly.
Cover with pasta.
Repeat the layers.
The last layer should be Pasta->Meat Sauce ->White sauce & Ricotta ->solid layer of mozzarella cheese.
Bake for 25-35 minutes.Watch it. You want nice and lightly browned top and cruchy tomato sides around the edge.
The cheese should be well melted. If it is not golden and bubbling then put under the broiler for a few minutes when finished cooking.
Tomato sauce may bubble out the sides and into your oven. You can put a baking sheet underneath, but this may affect cooking time. Expect to add up to an hour.
Let cool for at least 10-15 minutes. This will be as hot as lava. ;)
Garnish with parsley and serve! SO GOOD.