Carole's write-up of her recipe - the best one of all. Follow the timing closely.
2 cups granulated sugar
2 cups light Karo corn syrup (1 16 oz bottle)
2 1/2 cups smooth peanut butter (Skippy is best imho)
1 Teaspoon real Vanilla extract
6 cups rice krispies
1 pkg (2 – 2 ˝ cups?) Nestle’s Tollhouse Morsels
13 x 9 glass pan
Best to have all of your ingredients “at the ready” including rice krispies poured into a giant measuring pitcher if you have one, don’t wanna waste time measuring when you need to be mixing!
In a large (4-5 qt?) preferably nonstick stock type pot, dump in sugar and cover with bottle of Karo, then bring sugar and karo syrup to a full boil over high heat, stirring constantly. Count to 60 seconds, exactly. Immediately turn off burner and stir in peanut butter& vanilla. When it is fully combined dump in rice krispies, stir until evenly combined and all rice krispies appear to be coated with pb mixture. Spread evenly in a 13 by 9 inch glass pan, pushing in firmly to flatten top with a nonstick spatula, then dump on chocolate chips somewhat evenly over entire pan of pb rice krispie stuff, DO NOT SPREAD, (yet). Leave pan sitting on stovetop or counter and set timer for 10 mins, THEN come back and spread melted chocolate chips evenly over pb stuff.
Refrigerate for a minimum of 1-2 hours before cutting, 3-4 hours seems ideal, longer is fine too, though if leaving in fridge much beyond 5-6 hours (overnite etc.), I recommend covering pan at that point (don’t cover before set up solid, then you will get condensation which would be very icky on these) for longer storage. I recommend removing pan from fridge, 15-30 mins prior to cutting, just to make it a little bit easier…but you will burn some calories cutting these regardless (yeah!). Chocolate should be totally “hardened” before cutting, no longer shiny, melty looking. Cut into small squares, these are very rich, more like candy than cookies. Plus in theory at least, they last longer if you cut them smaller? Store cut bars in Tupperware or similar airtight containers either in fridge or on counter, fridge is best if it’s at all warm, as the chocolate will melt and get messy otherwise and besides, they are harder to bite into when cold, (limiting the amount you can eat?) causing you to eat less because your jaw gets tired faster?
Enjoy!