Making one from scratch requires 50 Cooking and the following ingredients:
a cake tin an egg a bucket of milk a pot of flour and a chocolate bar or chocolate dust
Add the ingredients (except chocolate) to a cake tin, cook it on a range, then use the chocolate bar or dust on the regular cake to get your chocolate dessert.
Getting A Cake (The Easy Way)
If you can’t make your own cake, you’ll need to get one elsewhere. The easiest to way to get a cake is to thieve it from the following locations:
Ardougne (Ardougne Baker’s Stall) Keldagrim (Keldagrim’s Best Bread) Kourend (Kourend Castle Baker’s Stall)
Alternatively, you can buy one from Sophanem at Nathifa’s Bakery Stall (pictured below). Remember that you need a whole cake to make a chocolate cake. You can’t use cake slices together to create a whole cake.
Baking A Chocolate Cake From Scratch
To bake a chocolate cake from scratch at level 50 Cooking or above, you need:
Cake tin x1 Egg x1 Bucket of milk x2 Pot of flour x1 And a chocolate bar or chocolate dust
Use all of the ingredients (except the chocolate bar) with the cake tin to get your batter. Then use that cake tin on a cooking range to get a normal cake. After that, simply use the chocolate bar or chocolate dust on the cake (remember to select the “use” option—don’t accidentally eat the chocolate bar or a slice of the cake!) You get 30 experience points in Cooking when adding a chocolate bar (or chocolate dust) to a cake.
Finding Eggs
There’s usually an egg spawn or two near most chickens. But on free-to-play worlds, there are four different egg spawns: Two eggs spawn at the Falador farm, north of Port Sarim. One egg spawns at Fred the Farmer’s farm house in Lumbridge. Five eggs spawn northwest of Fred the Farmer’s house in Lumbridge. And three eggs spawn by the house northwest of the bridge on the island of Entrana. On members-only worlds, there are two different egg spawns: One egg spawns by the chicken shrine in Zanaris. And two eggs spawn on Mary and Gordon’s farm south of the Farming Guild in the Kebos Lowlands. Eggs can also be bought at the Culinaromancer’s Chest in Lumbridge Basement.
Getting A Bucket of Milk
To get a bucket of milk, simply use a bucket on a dairy cow. Dairy cows can be found on most farms, but the easiest one to get to is either on Falador farm, or the cows on Lumbridge West farm or Lumbridge East farm. As for spawns, there’s only one bucket of milk spawn in the whole map. This is located east of the long hall in the town of Relleka, north of Seers’ Village. Players with any type of larder in the kitchen of their player-owned-house can even get an unlimited supply of buckets of milk. So this is probably the best location to source milk if you have your own kitchen. And just like eggs, buckets of milk can also be bought at the Culinaromancer’s Chest in Lumbridge Basement.
Getting A Pot of Flour
Flour is made at windmills (the Zanaris and Harmony Island windmills don’t work). The closest windmill to a bank is the one in the Cooks’ Guild (which requires level 32 cooking and a chef’s hat to enter). Just add grain to the hopper at the top of the windmill and then operate the hopper controls. Then, on the ground floor, use an empty pot on the flour bin to get a pot of flour. This process doesn’t give any cooking experience. But just like milk & eggs, pots of flour can also be bought at the Culinaromancer’s Chest in Lumbridge Basement.
Getting A Cake Tin
The easiest way to get a cake tin is to buy one a general store, as most general stores stock them. Alternatively, players with wooden shelves in the kitchen of their player-owned-house have access to an unlimited supply of cake tins. Cake tins can also be bought at the Culinaromancer’s Chest in the Lumbridge Basement as well. And there’s also a cake tin that spawns in the Cooks’ Guild, along with one in the western ruins of the Wilderness.
Getting Chocolate
It’s best to get chocolate bars from shops. Any of these will work:
Rok’s Choc Box in Nardah stocks 25 chocolate bars at 10gp each. The Grand Tree Groceries shop in the Grand Tree stocks 20 chocolate bars at 10gp each. Funch’s Fine Groceries in the Grand Tree also stocks 20 chocolate bars at 10gp each. The Baker’s Stalls in the east and west of the Ardougne market in East Ardougne stock 9 and 7 chocolate bars respectively at 10gp each.
Pictured below is Rok’s Choc box in Nardah. Chocolate bars can also be bought at the Culinaromancer’s Chest in Lumbridge Basement as well. Chocolate dust is made by using a chocolate bar on a pestle and mortar. Or it can be bought at 2gp each from Funch’s Fine Groceries and Grand Tree Groceries, both located at the Grand Tree. In fact, buying chocolate dust is actually cheaper than chocolate bars.
Trivia
On February 26th, 2015, an update made partially eaten versions of the chocolate cake (1/3 Chocolate cake and 2/3 Chocolate cake) untradeable.