Cheesy Roasted Garlic Spaghetti Squash with Spinach

Ingredients (12)

• + 3 tablespoons olive oil, divided, or as needed add to pantry
• ✓ 1 (2 pound) spaghetti squash, halved and seeded
• + ¼ teaspoon kosher salt, or to taste add to pantry
• + ⅛ teaspoon freshly ground black pepper, or to taste add to pantry
• ✓ 4 cloves garlic, unpeeled
• + 1 teaspoon onion powder add to pantry
• + ½ teaspoon dried basil add to pantry
• + ½ teaspoon dried oregano add to pantry
• + ½ teaspoon dried parsley add to pantry
• + 1 cup chopped fresh spinach add to pantry
• + 6 tablespoons shredded mozzarella cheese, divided add to pantry
• + 6 tablespoons grated Parmesan cheese, divided add to pantry