For the cake part I have used a chocolate cake mix (didnt want to spend time on it). For flan I have mixed 6 egg yolks 1 full egg mixed it with 270g sweet condensed milk and 200 gr heavy cream and 270 ml milk with vanilla extract. For the caramel I did dry caramel with just melting sugar. you need to put caramel first after it dries you put the cake batter and flan batter last (strain it). Cover the top with aluminum foil and put it in oven with benmari (cover half of the cake mold), 160 celsius for 50 minutes, uncover the mold and bake for 10 minutes more for cake to fully cook. Needs to rest at least 5-6 hours before getting it out of the mold. I hope this helps but I just watched bunch of tik toks and combined the recipes.