When making a coca-cola cake I follow the directions exactly. But when it comes out of the oven it appears all the miniature marshmellows went to the center and sank. Hard to frost when the middle is sunken in. What am I doing wrong?

  • coca cola cake? is there a diet coca-cola recipe as well? Dec 8, 2010 at 13:44
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    Can you hook us up with the recipe? It'll help folks figure out what might have happened.
    – bikeboy389
    Dec 8, 2010 at 14:51
  • Are you adding carbonated coke, or is it flat when you add it to the recipe? I've never made a coke or 7up cake, but I'd think that a carbonated soda might add too much leavening, as Chai mentioned.
    – Joe
    Dec 10, 2010 at 20:16

3 Answers 3


Without looking at the recipe, I can't know for sure, but I have a couple of ideas. First idea is to check your oven temperature. Oftentimes ovens will run hot or cold, and you might not know it for years. Get an oven thermometer and match the pre-heat temperature to the temperature on the thermometer. That will help your cakes bake more exactly.

Next idea. You may be putting too much leavening in the cake. Too much baking soda or baking powder could cause your cake to fall, and it also can impact the flavor.

  • Definitely check your oven temperature, you can pick up an oven thermometer for a few dollars at a place like target or wal-mart (even most grocery stores have them). I've only ever had this problem when my cakes have not set all the way, the raw dough in the middle causes it to collapse. If your oven temp is off, following the baking time in the recipe exactly could be doing you a disservice.
    – dani
    Dec 9, 2010 at 18:29

It may be something about the recipe itself but often cakes sink in the middle because they rise too quickly in the over and then when the cake cools there isn't enough structure to support the middle. You can alleviate this problem fairly well by dropping the temperature you bake the cake at by about 25 degrees or so and then adding 10-15 minutes to the bake time.


It might be the type of pan, is it a darker colored pan? The batter is probably heating more around the outside, so as it sets, it's pushing the marshmallows toward the middle (either that or it happens when you pour it, which I doubt). They sell A wrap for cake pans that you soak in water first. It's similar to using a water bath in that it holds some liquid on the edge of the pan to keep it from getting too hot too quickly. Or you could try a waterbath and see if that makes a difference.

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