Related על ביצה 33:9

One must not bale for the Sabbath on the holiday; but he may fill a cauldron with meat, even if he eats but a little of it. One may fill a kettle with water, even if he only drinks one cup of it; but whoever bakes may only bake for his needs. R. Shimon ben Elazar says: One may fill his oven with bread; because the bread is good when the oven is full.