Yes. To cook stuffed peppers in the crockpot, skip blanching the bell peppers first. They will be spending an extended amount of time in the slow cooker, so they will have enough time to soften as they cook. Simply fill your peppers with your prepared filling, transfer cut-side-up to your crockpot, and cook on low heat for approximately 4 hours. Top with cheese in the last 15 minutes or so.