Assume you are looking for something to take back as a gift.
Haven't seen anything for an Easy Bake Oven, but your neice might like the Princess Cocoa. It comes in tins and actually makes colored hot cocoa, LOL. IIRC, it makes pink, green and blue and comes in a 3-pack assortment, as well as in individual tins. My nieces loved it and my SIL said it actually tastes quite good. She also said to follow the directions and to use the amount of powder specified - if you use less, it's like drinking hot, colored water, LOL!
This also comes in Mickey tins and I think, Buzz Lightyear.
Best wishes -