Preheat oven to 375°F. Grease a 9-inch pie dish with olive oil.

Cook spaghetti according to package instructions. Drain and set aside.

In a skillet, cook ground beef, green pepper, and onion over medium heat for 10 minutes until beef is browned. Stir in pasta sauce, chili powder, salt, and pepper. Simmer for 6 minutes.

In a small bowl, whisk eggs and cottage cheese until well combined.

In a 9-inch pie dish, layer cooked spaghetti, then spread the cottage cheese and egg mixture over it. Top with beef mixture and sprinkle with shredded mozzarella cheese.

Bake in the preheated oven for 35 minutes or until the top is golden brown. Let stand for 5-10 minutes before slicing.