Before you can put the Lasagna in the oven, you have to prepare the 4 main ingredients.
Boil lasagne noodles for 4-5 minutes...(The noodles should behalf cooked)
To your favorite store bought sauce, add sauted tomatoes, garlic, onions, and mushrooms. I like to add soy sauce, red wine, oregano, basil, black pepper ...anyway, season to your liking. (Add browned and drained ground beef or turkey if you like.)
Mix 2 parts ricotta with 1 part sour cream in a bowl.
Grated mozzarella ( mix in some grated swiss if you like.)