Mix the batter as usual, set 1 cup aside in another bowl and add 2 and 2/3 tbsp cocoa, mix thoroughly. After you’ve put the main batter in the baking pan, pour in the chocolate batter (as swirls or dollops), drag a knife through lightly to make patterns, bake, See allrecipes site and their recipe for marble cake for more help.
Got confused and answered your other question about marble cake here. If you mean peanut butter (only) marble cake, mix a few tablespoons of peanut butter with 1 cup of set-aside batter, and swirl that into the plain batter as described. If you want peanut butter chocolate marble cake, mix both peanut butter and cocoa powder into the 1 cup set aside batter and then proceed to swirl it in just before baking.
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After you’ve put the main batter in the baking pan, pour in the chocolate batter (as swirls or dollops), drag a knife through lightly to make patterns, bake,
See allrecipes site and their recipe for marble cake for more help.
If you mean peanut butter (only) marble cake, mix a few tablespoons of peanut butter with 1 cup of set-aside batter, and swirl that into the plain batter as described.
If you want peanut butter chocolate marble cake, mix both peanut butter and cocoa powder into the 1 cup set aside batter and then proceed to swirl it in just before baking.