Here's a little trick for getting flat cake tops! The tops of my cakes actually weren’t all that flat, but when I flipped them out of their cake pans, the bottoms certainly were! So that’s why they look so flat. You’re seeing the bottoms of the cakes! So when I frost them, I place them all upside down to have flat "tops" to my cake. If you overmix your batter, you will tend to have more of a peaked top. If you are wanting to frost a two or three layer cake, use a serrated knife to cut off the tops to achieve that flat, level cake.