Old English bacan "to bake, to cook by dry heat in a closed place or on a heated surface," from Proto-Germanic *bakan "to bake" (source also of Old Norse baka, Middle Dutch backen, Old High German bahhan, German backen), from PIE *bheg- (source also of Greek phogein "to roast"), extended form of root *bhē- "to warm" (see bath). Related: Baked (Middle English had baken); baking. Baked beans attested by 1803.
1560s, "process of baking," from bake (v.). As "social gathering at which baked food is served," 1846, American English.