To ensure that the bundt cake is cooked through, you can insert a toothpick, wooden skewer, or cake tester into the cake and see if it comes out wet. You want there to be a few crumbs on there, but if you can tell that there is wet batter sticking to the toothpick, let it bake a bit longer (a good rule of thumbs is to bake for 2 more minutes, then test again).