First off, when you u003cstrongu003eshake the pan,u003c/strongu003e the batter shouldn't move at all when the bars are done. u003cbr/u003eu003cbr/u003eThe best check for doneness though is tou003cstrongu003e use a toothpick u003c/strongu003eto check it comes out clean when inserted into the center of the pan.u003cbr/u003eu003cbr/u003eAlso, make sure you u003cstrongu003ego for the full bake time,u003c/strongu003e even if you think your bars are ready early u003cemu003e(the top will look fully baked long before the bars are actually done)u003c/emu003e.