Yiddish snack of fried or baked dumpling dough filled with meat potatoes cheese vegetables?

The Yiddish snack you're describing is most likely a Knishe (pronounced KNEESH-uh).

Knishes are a popular street food and home-cooked treat in Jewish communities. They are made with a simple dough (often potato-based) filled with a variety of savory ingredients like:

* Meat: Ground beef, chicken, or even brisket are common fillings.

* Potatoes: Mashed or chopped potatoes are a classic addition.

* Cheese: Often used in combination with other fillings, like a cheese and potato knishe.

* Vegetables: Cabbage, onions, and carrots are popular choices.

Knishes can be either fried or baked, resulting in crispy or soft textures. They are a delicious and satisfying snack, often served warm with mustard or ketchup.