Place folded, clean dish towel under cover of cooker. This will prevent condensation from dripping down onto pizza. Cover; cook on High heat setting 45 minutes. Carefully remove slow cooker’s ceramic insert, leaving cover on, and rotate insert 180°. Continue to cook on High heat setting 30 to 60 minutes or until crust edges are deep golden brown, cheese is melted, and thermometer inserted in center reads 165°F.