Place the potatoes in a large pot and cover them with cold water by 1 inch.
Stir in 1 teaspoon of the sea salt.
Bring to a boil over high heat, then reduce the heat and simmer, uncovered, for 8 to 15 minutes, or until the potatoes are fork-tender.
Drain the potatoes and let them cool until easy to handle.
Slice each potato in half.
Preheat a grill or grill pan to medium heat.
In a large bowl, toss the halved potatoes with olive oil, garlic powder, onion powder, smoked paprika (if using), the remaining 1 teaspoon of salt, and freshly ground black pepper.
Brush or spray the grill grates with avocado oil.
Place the potatoes cut-side down on the grill and cook for 5 to 6 minutes, or until char marks appear.
Flip the potatoes and grill for another 5 minutes, or until they’re well-charred and tender.
Season to taste and garnish with fresh herbs, if desired.