Can my old employer, a bakery, prohibit me from ever selling cupcakes?

Question Details:

I used to work for a cupcake shop. I have since left and bake out of my house part time. I sell cupcakes occasionally and someone tipped off my ex-employer that I sold cupcakes. He then proceeded to call me and inform me that I signed a contract stating that I am not allowed to sell cupcakes again ever for any sort of profit. He refuses to let me see this copy of the contract. I state that the only paper I signed was a non-disclosure statement about recipes from the shop. He claims that I agreed never to make cupcakes again for profit. Is this possible?

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