Increasing a cake recipe
I am making a Nigella Lawson lemon/polenta/almond cake that calls for a 9" springform pan. I want to feed a few more people so I was going to switch to a 10" springform. Should I increase the recipe by ½ more or by 1/3 more? The recipe has 3 eggs in it so I thought it would be easier to increase it by a third.