: Basic options like White Cake or Chocolate Cake are available at Level 1 Cooking Skill.

: During a planned social event, you can hire a Caterer who is responsible for baking a cake autonomously, though this can sometimes be unreliable. Manual Preparation (The Standard Way)

Birthday cake rant. Am I missing an easy option or? : r/Sims4

: Click on the finished cake and select "Add Birthday Candles" (this costs 10 Simoleons). Pro Tips for Managing Cakes

: Click on a fridge or stove and select "Cook..." (not "Bake").

: You can download a room from the Sims 4 Gallery that already contains a prepared cake. Once you place the room on your lot, you can move the cake to your preferred table and add candles.

: If you have the Get to Work expansion, you can visit a player-made or pre-built bakery to purchase a cake directly from a display case.

: If you have the Dine Out game pack, you can visit any restaurant, click on your table, and order a cake to be delivered immediately. You can then place candles on it right at the restaurant or drag it into your Sim's inventory to take home.