Yes, if the Challah is dry (otherwise regardless it is forbidden on Shabbos) and the pot is totally closed and cover is clean and dry. If the crockpot cover…
Yes, if the Challah is dry (otherwise regardless it is forbidden on Shabbos) and the pot is totally closed and cover is clean and dry. If the crockpot cover…
The oven should be clean from actual residue between fish and meat. Some are particular to designate separate pots for both or in the case of an oven preheat…
If the grill or cedar plank is totally clean, it is okay. See here and here.
No, unless they’re not eaten together with the fish.