The term 'Wonderland Dessert' is a reference to the classic novel Alice's Adventures in Wonderland by Lewis Carroll. The two crossword solutions for this term are 'TARTS' (5 letters) and 'TART' (4 letters). Tarts are a type of pastry dessert that typically consists of a sweet filling inside a pastry crust. They can be served hot or cold, and can be filled with a variety of ingredients such as fruits, custards, and jams.