Preheat your oven to 375 degrees. And grab a large 12 inch cast iron skillet.
Add a tablespoon of olive oil and sauté the diced carrots and onion for about 3-4 minutes. Now add the ground beef, seasonings, garlic and cook 2-3 more minutes. Now add the green bell pepper. Continue to cook until the beef is browned and cooked through.
With a slotted spoon, remove the meat and veggie mix from the skillet and place it on a plate. Drain the extra grease.
Now make the ricotta mixture in a medium bowl. Add the container of ricotta, egg and oregano and mix until combined and smooth. Set aside.
Now we will start to layer the lasagna. Pour a ladle full or a thin layer of sauce on the bottom of the skillet. Lay 2 oven ready lasagna noodles on top of the sauce to form the first layer. You can break some noodles to fill the the rest of the circle. Add spoonfuls of ricotta on top of the noodles and spread it smooth. Now add a layer of the beef and veggie mixture. And a thin layer of mozzarella on top.
Repeat the same steps as above Add a layer of sauce on top of the mozzarella, add the noodles ricotta, beef and mozzarella)
Repeat these steps one more time.
To top things off, add one more layer of noodles, the rest of the sauce and remaining mozzarella.
Bake in the oven for 20-25 minutes. Let it cool for about 5-10 minutes before slicing. Enjoy!