Simplify the following text for a Grade 4 native English-speaking person.
Original: A butter cake is a cake in which one of the main ingredients is butter . Butter cakes consist of taking the most basic of ingredients butter , sugar , eggs , flour , and a leavening agent ( baking powder or baking soda ) and transforming them into a baked good .
Simplified: Butter cakes are high in fat because they contain so much butter .