"一次烘焙的量" can be translated into English as "the quantity for one baking batch" or "the amount for a single baking session".
Both expressions convey the idea of the quantity of ingredients or dough used for one instance of baking. The choice between them may depend on the specific context or the level of formality desired.
"The quantity for one baking batch" is more precise and technical, often used in recipes or professional baking contexts.
"The amount for a single baking session" is more conversational and might be used in everyday discussions about baking.