Preheat the grill or grill pan over medium heat.
Cut the avocados in half and remove the pit. You can use a spoon to gently scoop out some flesh if desired for a larger opening.
In a small bowl, mix together the olive oil, sea salt, black pepper, and garlic powder.
Brush the cut sides of the avocados with the olive oil mixture.
Place the avocados cut side down on the grill. Grill for about 3-4 minutes until you see nice grill marks and the avocado is warmed through.
Remove the avocados from the grill using tongs. If using, squeeze fresh lime juice over the top for added flavor.
Optionally, garnish with chopped cilantro or parsley before serving.
Serve grilled avocados as they are, or use them as a topping for grilled meats, salads, or tacos.