Mix the first three ingredients and press them onto the bottom of a springform pan (26 cm diameter). Bake for 10 minutes in an oven preheated to 175 ° C. Increase the temperature to 230 ° C.
Stir cream cheese and sugar until creamy. Stir in cocoa and flour on medium heat. Stir in the eggs one at a time. Add the sour cream and Baileys on a low level.
Place the cream cheese mixture on the pre-baked base and bake at 230 ° C for 10 minutes, then switch the temperature down to 120 ° C and bake for another 60 minutes. Chill until serving.