Is biscuit countable or uncountable noun?

"Biscuit" can be both countable and uncountable, depending on how it's used:

Countable:

* When referring to individual, separate biscuits: "I ate two biscuits for breakfast."

* When used as a specific type of food: "We have a variety of biscuits in our bakery."

Uncountable:

* When referring to biscuit as a general substance or category: "I love the smell of biscuit baking in the oven."

* When referring to biscuit dough: "This recipe uses a lot of biscuit dough."

So, whether "biscuit" is countable or uncountable depends on the context and what you're trying to say.