Microwave together the corn syrup, sugar, and peanut butter until they are all goopy and mixed together - usually around 2 minutes. Make sure to stop and stir every 30 seconds so it doesnt burn.
Mix the goop one last time until it is consistant, then mix it together with the rice krispies.
Press the mixture into a glass casserole dish (the size doesn't really matter. The smaller the pan, the thicker they will be.)