Which dish is meatless and features mushrooms prominently?

Mushroom Chicken is the dish that is meatless and features mushrooms prominently. This dish focuses on mushrooms as the primary ingredient, which aligns with the question's requirement for a meatless option. While it may initially sound like it involves chicken, the context provides clarity that mushrooms are the standout feature. In contrast, the other options – Tangy Jumbo Shrimp, Shanghai Angus Steak, and Beijing Beef – all contain meat, which does not fit the criteria of being meatless. Thus, Mushroom Chicken is the correct and only appropriate choice for a dish that is meatless while highlighting mushrooms as a key ingredient.