Easy & Juicy recipe cornish game hens baked: My Fail

Ingredients

• 4 Cornish game hens (about 1-1.5 lbs each)
• 2 tablespoons unsalted butter, softened (28 g)
• 3 garlic cloves, minced
• 2 lemons (1 juiced, 1 sliced)
• 2 teaspoons fresh rosemary, chopped (or 1 teaspoon dried)
• 2 teaspoons fresh thyme, chopped (or 1 teaspoon dried)
• Salt and pepper to taste
• 4 medium carrots, peeled and cut into chunks
• 2 medium potatoes, quartered
• 1 red onion, cut into wedges
• 2 tablespoons olive oil (30 ml)