Chicken & Veggie Fettuccine | Lazy Cooking

Ingredients

• 12 ounces fettuccine
• 5 tablespoons butter, divided
• 1 small onion, chopped
• 3 tablespoons all-purpose flour
• 1 (14.5-ounce) can chicken broth
• 1 cup heavy cream
• 1 1/4 teaspoons salt
• 1/4 teaspoon pepper
• 1 (12-ounce) package frozen mixed vegetables, such as carrots, green beans, corn, and peas
• 2 cups chicken breast, cooked and sliced