Missisipi Mud Cupcakes

I adapted this recipe from "Cupcakes by Elinor Klivans". I like the idea of putting crushed orea at the bottom of the batter follow by choc chips, then top the batter again with crushed oreo. A little time consuming in crushing the oreo, But worth it.Some how my cake came out as shrinked but they really taste good. Will try again next time.
This cake looks like burn right ? No they are not really er could be those oreo crushed