Ingredients

• 1/2 cup chopped fresh mushrooms
• 3 tablespoons finely chopped onion
• 2 garlic cloves, minced
• 4 tablespoons butter, divided
• 3 tablespoons all-purpose flour
• 1 1/4 cups milk
• 3/4 cup mayonnaise
• 4 cups cubed cooked chicken
• 3 cups cooked long-grain rice
• 1 cup chopped celery
• 1 cup frozen peas, thawed
• 1 (2 ounce) jar diced pimientos, drained
• 2 teaspoons lemon juice
• 1 teaspoon salt
• 1/2 teaspoon pepper
• 3/4 cup coarsley crushed cornflakes