I'm a little at a loss to what you mean by "like a cake," do you mean "chewy?" Or, do you mean "light and airy?"
Chef peon made some excellent points.
As chefpeon wrote:
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If you include the entire formula you are using then we are better able to help.
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Always a help, especially with baking. Most especially when the description of the problem is ambiguous.
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The method in which you mix your cookie dough also has an effect on the final outcome.
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Yes to this as well.
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If you substitute sugar with honey or agave nectar that will have an effect on the texture of the cookie also.
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Sugar has the effect of making cookies crisp, compared to either honey or agave. More likely than not, this is at least partly why you get "like a cake" cookies -- if by "like a cake" you mean chewy.
Another possibility is that you're baking at too low a temperature, and yet another is that you're not cooking all the way through. In fact,
the first suggestion I'd make (other than changing the ingredients) is to cook a little longer at a slightly higher temperature.
Most bakers expect a substitution of whole wheat for white flour to result in a much heavier cookie (or any other baked good, for that matter); and heavier is not consistent with "like a cake," at least not in the way most of us think of cake. That may account for some of the confusion. On the other hand, if by "like a cake" you mean "light and fluffy," we all want to know your secret.
If you could be more specific about your recipe -- in terms of ingredients, techniques, times and temperatures -- and perhaps try another description of what you're going for and what you're getting which doesn't include a comparison to cake, it could help us help you.
Finally, as a general rule, oatmeal cookies are supposed to be and are generally expected to be chewy and not crisp -- this has everything to do with the nature of oatmeal and the type of sweeteners (molasses, brown sugar) usually employed.
Keep on experimenting and stay in touch,
BDL