$20 for food for a week?

Can you guys give me some ideas on what meal stuff I can buy that will last for a week for 2 adults and a 4 year old. We ate spaghetti and peanut butter sandwiches all last week and I think we are gonna throw up if we make spaghetti again lol. I was thinking chili but my son wont eat that. I have a little bit of pancake mix and 2 boxes of mac and cheese and spaghetti noodles already.