Saute garlic and onion with a little oil over medium-high heat. (Also add veggies if using)
Add ground meat and cook until meat is no longer pink.
Add jar of spaghetti sauce.
After dumping the sauce, add about 1/4 cup water to the jar, put the lid on and shake it up. Then add to pan. This helps you not waste sauce!
Put ricotta in a bowl and add warm water. Stir to combine. Add egg, if using, and spices.
In a 9×13 pan, add a thin layer of sauce to the bottom.
Top with noodles.
Spread 1/3 of the ricotta mixture across the noodles.
Top with 1/3 of the sauce and a sprinkle of mozzarella.
Repeat the layers 2 more times, finishing with a heavier layer of mozzarella on the very top.
Cover with foil and bake at 375 for 25 minutes. Take the foil off at bake another 10 minutes. (Or follow package directions for your no-boil noodles for cooking time).
Let lasagna rest for at least 10 minutes before cutting.