Islamic ruling on cafe cake

Merely going to a conventional café and eating cake is not inherently prohibited in Islam. However, the ruling depends on the ingredients of the cake and the surrounding circumstances.

If the cake does not contain any haram ingredients (such as non-halal gelatin, alcohol, or other prohibited substances), and there is no strong reason to believe that it has been contaminated with impure or haram items, then it is permissible to eat.

However, if it is known, or there is a strong likelihood, that the cake contains haram ingredients or has been contaminated through contact with prohibited items, then it is not permissible to consume it.

Likewise, if sitting in that café involves participating in or supporting sinful activities, or poses a risk to one's faith and religious commitment, then one should avoid going there.

Although eating only the cake may be permissible under the above conditions, it is still preferable, as a matter of precaution, to avoid visiting such places whenever reasonably possible, since they often involve doubtful matters, the possibility of contamination with haram items, and other religious concerns. The Prophet ﷺ encouraged Muslims to avoid doubtful matters; therefore, exercising caution is better and provides greater peace of mind.