1. Preheat the oven to 400°F (200°C).

2. Heat 60 ml (1/4 cup) of olive oil in a large skillet over medium-high heat and add 1 medium diced onion. Cook until the onion is translucent, about 5 minutes.

3. Add 2-3 cloves of minced garlic to the skillet and cook for another minute.

4. Combine the cooked onion mixture, 450g (1 lb) ground beef, 1 tsp dried oregano, 1 tsp paprika powder, 1 tsp salt, and 1/2 tsp black pepper in a large mixing bowl. Mix well with your hands until just combined.

5. Whisk together 2 eggs and 60g (1/2 cup) grated Parmesan cheese in a separate bowl. Add this mixture to the meat mixture and mix until just combined.

6. Transfer the meat mixture to a 23x33cm (9x13-inch) baking dish and smooth out the top. Arrange 2-3 sliced tomatoes on top of the meat mixture.

7. Mix 60 ml (1/4 cup) of olive oil and 120g (1/2 cup) of grated cheddar cheese in a small bowl. Spread this mixture evenly over the tomatoes.

8. Bake in the preheated oven for about 35-40 minutes or until the top is golden brown and the meat is cooked through.

9. Remove from the oven and sprinkle with chopped parsley. Let it rest for 10 minutes before slicing and serving.