Tell your grandma how great you can cook on the phone, send her a lot very cool photos on WhatsApp of your cooking
and than say "IDK why my batter overflood and now my entire waffle mashine is ruined. Don't ask me, I just followed a 5/5 rated recipe that was rated by 1K people"
Do not be like me, your grandma will think you are irresponsable and can't do shit when you tell her about the online recipe you failed at