A fudgy brownie that isn't keto but uses sweetener instead of sugar recipe?

I am trying to look for a fudgy brownie recipe that isn't keto(that isn't high on fat), nor uses a ton of sugar(for example, +30g of sugar per square). Preferably sugar-free sweetener.

I am looking for a balanced one where it uses oat flour(for instances) and somewhat of a stevia/erythritol combo?

bon appetit