1. Preheat the oven to 400°F. Scrub the potatoes, dry them well, rub them with olive oil, and season with salt and black pepper. Place them on a baking sheet and bake for 50 to 60 minutes, or until fork tender.

2. Let the potatoes cool slightly until safe to handle. Slice each potato lengthwise and carefully scoop out the centers, leaving a thin border so the skins hold their shape.

3. Place the scooped potato flesh in a large bowl. Add butter, sour cream, cheddar cheese, and mozzarella cheese, then mash until creamy and well combined.

4. In a skillet over medium heat, add a small drizzle of oil or a bit of butter. Sauté the garlic for about 30 seconds, then add the shrimp and Cajun seasoning. Cook for 2 to 3 minutes until the shrimp turns pink.

5. Gently fold in the crab meat and cook for 1 minute more, just until warmed through.

6. Add half of the seafood mixture to the mashed potato filling and stir gently to combine.

7. Spoon the filling back into the potato shells. Top with the remaining seafood mixture, extra cheddar cheese, and a light drizzle of melted butter.

8. Return the stuffed potatoes to the oven and bake for 10 to 15 minutes, until hot and melty.

9. Sprinkle with chopped green onions and serve warm.