As you say «Simples» Think of the ocean as an open pot of warm water with constant heat input (TSI) at a level where water is held at constant temperature by evaporation and internal convection. (judithcurry.com)
If you have trouble, just warm the bowl and batter in the microwave or over a pot of warm water. (mynourishedhome.com)
If you are opposed to the microwave, put your mixing bowl over a pot of warm water. (mynourishedhome.com)