a cake that has a coffee flavour, usually in two layers with coffee flavour icing between them and on the top, and sometimes also walnuts (= a type of nut) on top

I'm just icing the coffee cake.

Would you like a slice of coffee cake?

a cake for eating with coffee, usually in a single layer, sometimes with fruit or nuts inside and sometimes made with yeast (= the substance that makes bread rise), often with streusel (= a mixture of butter, sugar, flour, spices, and sometimes nuts) on top

I use candied lemon peel in a streusel topping for blueberry coffee cake.

This is a healthy coffee cake made with apple.