Sentence structure "I'm [doing something] because [reason]"? I am familiar with the sentence structure "因为。。。所以。。。," but what is the correct way to say "I am [doing something] because [reason]"?

For example, "I am asking this question because I am clueless."

Does "因为。。。所以。。。" still apply in this case?
I think “因为。。。所以。。。” still applies in this case. Or you could say “我。。。是因为。。。”

For example: 


  我吃蛋糕是因为我饿了。= I am eating the cake because I am hungry.
  Wǒ chī dàn gāo shì yīn wèi wǒ è le