be a doddle
From Longman Dictionary of Contemporary Englishbe a doddlebe a doddleEASY British English informal to be very easy The exam was a doddle! → doddleExamples from the Corpusbe a doddle• As well as being easy to fly, the Aircoupe is a doddle to land.• Playing Spot the Brit on the beach is a doddle.• He says formation flying is a doddle.• "You passed your driving test?'' "Yes -- it was a doddle!''• After that, Ben Tee is a doddle.• It looked like it was going to be a doddle.• The following week was a doddle.• But there's one which is a doddle to remember.