Preheat your oven to 400°F (200°C).
Wash the zucchinis thoroughly and trim the ends.
Cut the zucchinis in half lengthwise.
In a large bowl, combine olive oil, garlic powder, oregano, salt, and pepper.
Add the zucchini halves to the bowl and toss to coat evenly.
Arrange the zucchinis cut side up on a baking sheet lined with parchment paper.
Roast in the preheated oven for 20-25 minutes until golden and tender.
Check for doneness by piercing with a fork; it should be soft but not mushy.
Remove from the oven and let cool for a few minutes.
Garnish with fresh basil before serving.