Preheat your grill to medium-high heat.
Wash the zucchinis thoroughly and slice them lengthwise into halves.
In a bowl, mix olive oil, salt, pepper, garlic powder, and Italian herbs.
Brush the zucchini halves generously with the oil mixture.
Place the zucchinis cut-side down on the grill.
Grill for about 5 minutes until grill marks appear.
Flip the zucchini and grill for another 4-5 minutes.
Check for tenderness with a fork; they should be soft but not mushy.
Remove from the grill and drizzle with lemon juice.
Garnish with fresh basil leaves before serving.