Oil Issue

i was having an oil issue i cant figure out,...any ideas.the problem i had was when i took off the valve covers there was this coffee with cream colored gunk everywhere,in the cover,on the rockers and springs,in the pcv valve and in the breather.i checked my oil by draining,it was clean.checked the rad and entire cooling system,once again clean.i even checked the trans fluid,clean again.the car was run at least once a week or more.i couldnt find a trace of this gunk anywhere except under the valve covers.could it be just from condensation or a crankcase venting issue?any ideas would be appreciated. thanks in advance!!!