marble cake
US /ˈmɑːr.bəl ˌkeɪk/
UK /ˈmɑːr.bəl ˌkeɪk/

1.
a cake made with light and dark batter, typically vanilla and chocolate, swirled together to create a marbled effect
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For dessert, we had a delicious slice of marble cake.
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She baked a beautiful marble cake for the party.