Nat's Shrimp and Veggie Stuffed Zucchini

INGREDIENTS

• 1 extra large zucchini
• 1/4 cup olive oil, divided
• 6 cloves garlic, finely chopped
• 1 shallot, finely chopped
• 1/2 pound large shrimp - shelled, deveined, and cut in half
• 1 large tomato - peeled, seeded and diced
• 8 cremini mushrooms, quartered
• 1/4 cup grated Parmesan cheese
• 8 leaves fresh basil, torn
• ground black pepper to taste
• kosher salt to taste
• garlic powder to taste
• 1/4 cup grated Parmesan cheese, divided