Chicken & Noodle Casserole

WHAT YOU'LL NEED

• 2 Tbsp. I Can't Believe It's Not Butter!® Spread
• 1 small onion, chopped
• 2 Tbsp. all-purpose flour
• 2 cups 2% milk *
• 1 tub Knorr® Homestyle Stock - Chicken
• 4 ounces medium size egg noodles, cooked and drained
• 2 cups cut-up cooked chicken
• 1 cup green peas