What type of batter should be mixed thoroughly until there are no visible lumps?

Belgian waffle batter should be mixed thoroughly until there are no visible lumps to ensure a light and fluffy texture that is characteristic of Belgian waffles. Proper mixing is essential as it helps to evenly distribute the ingredients, which is particularly important for leavening agents like baking powder or baking soda used in the batter. This thorough incorporation contributes to the structure and rise of the waffle when cooked, preventing any dense or uneven areas.

In contrast, other batters may not require the same level of mixing. For instance, pancake batter can benefit from leaving a few lumps, as over-mixing can lead to rubbery pancakes. Chocolate chip batter often includes added ingredients like chips that should be folded in rather than mixed vigorously, while crepe batter, typically requiring a smooth consistency, may be combined in a way that allows for slight lumps, akin to pancake batter.