potluck chicken casserole

Ingredients

• 1/2 cup mushrooms, freshly chopped
• 3 tablespoons onion, finely chopped
• 2 - garlic cloves, minced
• 4 tablespoons butter
• 3 tablespoons all purpose flour
• 1.25 cups milk
• 3/4 cup mayonnaise
• 4 cups chicken, cooked and cubed
• 3 cups long grain rice, cooked
• 1 cup celery, chopped
• 1 cup peas, thawed
• 2 ounces pimentos, drained
• 2 teaspoons lemon juice
• 1 teaspoon salt
• 1/2 teaspoon pepper
• 3/4 cup corn flake cereal, crushed