Cornish Hen

Name: Cornish Hen
Prep time: 20 min
Cook time: 55 min
Total time: 1 h 15 min
Cuisine: American
Ingredients: 2 cornish hens (about 1.5 pounds each); 3 tablespoons olive oil (divided); ½ teaspoon kosher salt (or to taste); ½ teaspoon dried rosemary (crushed); ½ teaspoon lemon zest; ¼ teaspoon black pepper; ¼ teaspoon dried thyme leaves; ¼ teaspoon garlic powder; 1 pound potatoes (cut into 1-inch pieces); 2 carrots (cut into 1-inch pieces); 1 onion (cut into 1-inch wedges); salt and black pepper (to taste)