Go ahead and make it for dinner. Serve some edamame on the side and some red plums. Resist the temptation to call you husband and let him hear your kids response to the Costco tortellini when they discover that's what is for dinner. After you scrape the tortellini off everyone's plate and get a new plate for the three year old (because the previous one was contaminated by the tortellini), ask if anyone wants some cheesy toast. You only have one taker out of three so you ask again just to be sure. When you explain that you are only making cheesy toast once and if they want some after they see their sister's, they are out of luck, you will probably have one more taker. While you're making the toast they will devour the edamame and one will be crying since the other two got more than her. Dig around in your freezer for another bag of edamame and get that started, because when your kids ask for seconds of something healthy, you happily oblige.
When you bring out the cheesy toast just take a deep breath and try to maintain your calm when the one who didn't want cheesy toast asks why you didn't make him any. It's your own fault for even asking who wants some, always assume they will want whatever their sibling has.
Oh yeah, I forgot to mention that after the presentation of the tortellini, the three year old started screaming for string pasta (spaghetti) and so you got that started before you asked about the cheesy toast. Try not to stick a fork in your eye, or you children's eyes when they don't touch the string pasta.
Lastly, when your husband comes home and asks what's for dinner, just put on a happy face and tell him there is plenty of that fabulous tortellini left and you'd be happy to warm it up for him.