So I'm having two issues, one of which seems to be listed here and one of which appears to be an old bug that lucky me has gotten again.
first, I too have a completely full Sim who bakes any pie or cake immediately takes a serving out of it, whether or not they're hungry. If they're hungry, they eat it. If they're not hungry, it gets stuffed in their inventory and I have to manually drag the single serving and the rest of it into the fridge. This is becoming an issue as I had turned aging off and was intending to use the birthday parties to age up but you can't put candles on a partially eaten cake. Unless they've changed that.
My second issue is a much bigger problem. The cake issue no longer happens because I can no longer cook. My master chef pulls ingredients from the fridge and starts to cook, then gives us the pathing failed thought bubble and then refuses to continue it. For whatever reason, my sim is able to make autumn salad still and cook on the bbq outside, but i've tried 3 or 4 other recipes on the stove/fridge and it just fails.
I've already tried deleting and replacing the stove and fridge, adding extra counters, moving the applicances on the counters around, moving the dishwasher around, (which half the time the sims seem to forget exists bc they wash their dishes in the sink instead) I've tried restarting the game, repairing Origin, doing save as to a new save file, clearing my cache files.
I have no mods. The only CC i have is some hairstyles, clothing, walls, and floors. And in the kitchen, the floors and walls are from the base game. Nothing of my CC could in any way cause an issue with cooking food.
I have Limited Edition Sims 4 with Get To Work.
Laptop:
GeForce GT 750M
Driver version: 378.49 (Latest one)
Intel Core i5-4200M CPU 2.50 GHS
8 GB Ram