In brief
King Arthur Baking's Belgian-Style Yeast Waffles use a yeasted batter that rests before cooking. The recipe explicitly calls for a bowl large enough for expansion.
Useful to know
King Arthur Baking's Belgian-Style Yeast Waffles use a yeasted batter that rests before cooking. The recipe explicitly calls for a bowl large enough for expansion. [1]
This differs from chemically raised batters intended for immediate cooking. Resting and temperature belong to the chosen recipe; do not transfer them mechanically between waffle types.
Sources
For further detail and to check the information: