Chicken Pot Pie Pasta

Ingredients

• 8 ounces pasta (such as penne or farfalle)
• 2 tablespoons butter
• 1 small onion, diced
• 2 carrots, diced
• 2 celery stalks, diced
• 2 cloves garlic, minced
• 2 cups cooked chicken, shredded or diced
• 1/4 cup all-purpose flour
• 2 cups chicken broth
• 1 cup frozen peas
• 1/2 cup heavy cream
• Salt and pepper to taste
• 1 sheet puff pastry, thawed
• 1 egg, beaten (for egg wash)