Cut the chicken into 1-inch cubes. Heat olive oil in a large skillet over medium-high heat.

Season the chicken cubes with salt, pepper, and Italian seasoning, then cook for 5-7 minutes until browned.

Alternatively, poach chicken in water or broth for 15-20 minutes until cooked through or bake at 400°F for 20-25 minutes.

In a medium bowl, combine cottage cheese, egg, Italian seasoning, garlic powder, and onion powder, and stir until well mixed.

Preheat oven to 375°F (190°C) and lightly grease a 9x13 inch baking dish.

Pour 1 cup of marinara sauce into the bottom of the baking dish and spread it evenly.

Evenly distribute the prepared chicken over the marinara sauce layer.

Spoon dollops of the cottage cheese mixture over the chicken layer, then sprinkle with mozzarella and Parmesan cheese.

Pour another cup of marinara sauce over the cheese layer.

In a bowl, combine breadcrumbs with olive oil and extra Italian seasoning, then sprinkle over the casserole.

Finish with remaining mozzarella and Parmesan cheese.

Cover with aluminum foil and bake for 25 minutes.

Remove foil and bake for an additional 15-20 minutes until cheese is melted and bubbly.

Let the casserole rest for 10-15 minutes before serving.