Here are some twists on this classic sandwich: Croque madame or croque-à-cheval (topped with a fried or poached egg) Croque provençal (with tomato) Croque auvergnat (with bleu d"Auvergne cheese) Croque gagnet (with Gouda and andouille) Croque norvégien (with smoked salmon instead of ham) Croque tartiflette (with sliced potatoes and Reblochon cheese) Croque bolognese / Croque Boum-Boum (with Bolognese sauce) Croque señor (with tomato salsa) Croque Hawaiian (with a slice of pineapple) "Croque McDo" sandwich at found at French McDonald's