) cooker My understanding is that the British use "cooker" where we Americans would use "stove", and there's nothing unusual about making pancakes on a stove, so I don't understand why you think making pancakes on a cooker is incorrect. In my opinion these are all fine. We can make pancakes on a [stove / cooker / griddle].
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MUSCOVITEWe can make pancakes on a (sic!) cookerMy understanding is that the British use "cooker" where we Americans would use "stove", and there's nothing unusual about making pancakes on a stove, so I don't understand why you think making pancakes on a cooker is incorrect.
CalifJimWe can make pancakes in [an oven / a pan / a frying pan].I just checked COCA for the word combination "on a frying pan".
MUSCOVITEreported hitsDid you also try to get hits on "in a frying pan"? Where I live, "in a frying pan" is the expression we use. I can accept those examples with "on". After all, it's easy to understand what is meant with either "in" or "on". Nevertheless, I don't use "on".
CalifJimDid you also try to get hits on "in a frying pan"?Yes, I did.
CalifJimNevertheless, I don't use "on".And so I can forget about those few odd examples with 'on...' once and for all