How do you make soft cookies?

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I've done it from the MIX ,cookie dough, recipes from oat meal! and the results are always the same ! there hard as a rock ,I've given up!!! I left in a jar one time and they were softer but they were in there for a while! Now I just make brownies! but I'd like to make some this christmas!! other people make fresh cookies and there soft can anyone help me!