- Cooking spray
- 6 zucchinis, halved lengthwise
- 1 tablespoon olive oil
- 1/2 onion, finely chopped
- 1 1/2 cups tomato sauce
- 2 tablespoons Italian seasoning
- Salt and ground black pepper to taste
- 1 egg
- 2 tablespoons shredded Parmesan cheese, or more to taste
Preheat oven to 350 degrees F (175 degrees C). Lightly spray a 13×9-inch baking dish with cooking spray.
Scoop seeds from zucchini halves; set aside.
Bring a pot of water to a boil. Add zucchini halves and cook until slightly tender, about 3 minutes. Transfer zucchini halves to prepared baking dish and set aside to cool.
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Heat olive oil in a skillet over high heat. Once oil is hot, reduce heat to medium-low. Cook and stir zucchini seeds and onion in hot oil until the onion is translucent, about 5 minutes. Stir tomato sauce into the onion mixture; season with Italian seasoning, salt, and black pepper. Cook the mixture at a simmer until the sauce begins to thicken, about 20 minutes. Transfer the mixture to a mixing bowl and allow to cool slightly.
Mix egg into the tomato sauce mixture; spoon into zucchini halves to fill. Sprinkle Parmesan cheese over the filling.
Bake in preheated oven until the filling is firm, 15 to 20 minutes.