Use a non-stick bundt cake tin. Grease the pan thoroughly. Use non-stick vegetable oil spray, melted shortening, or butter. Use a pastry brush to apply melted shortening to all its nooks and crannies. After that put 1 tbsp flour or granulated sugar into the greased pan before adding the batter. After baking let the bundt cake cool for about 10 minutes on a cooling rack and remove it from the tin. If you wait longer the butter will become hard again and that makes it harder to remove the cake from its pan.