Cook lasagna noodles according to package directions. Drain and set aside.
In a large skillet, brown ground beef over medium heat. Drain off any excess grease. Add onion and green bell pepper, and cook until softened, about 5 minutes. Stir in garlic and cook for 1 minute more.
Stir in crushed tomatoes, tomato sauce, oregano, salt, and pepper. Bring to a simmer, then reduce heat and cook for 10 minutes, stirring occasionally.
In a medium bowl, combine ricotta cheese, 0.5 cup mozzarella cheese, Parmesan cheese, beaten egg, parsley, and chives. Mix well.
Preheat oven to 375 degrees F (190 degrees C).
Spread a thin layer of the meat sauce on the bottom of a 9x13 inch baking dish.
Arrange half of the cooked lasagna noodles over the sauce. Spread half of the ricotta mixture evenly over the noodles.
Top with half of the remaining meat sauce. Repeat layers with remaining noodles, ricotta mixture, and meat sauce.
Sprinkle the remaining 0.5 cup mozzarella cheese over the top.
Cover the baking dish with aluminum foil and bake for 25 minutes. Remove foil and bake for another 20-25 minutes, or until bubbly and golden brown.
Let the lasagna stand for 10 minutes before cutting and serving.
Notes
For an extra green touch, you can add a layer of cooked spinach with the ricotta mixture. Garnish with extra chives and parsley before serving.