Best place to buy whole cakes in Cologne?

Need something fancier than just a standard bakery but not too expensive (willing to pay up to 50€). Preferably somewhere in innenstadt or alt stadt. And on short notice, would like to pick it up this evening.

By whole cakes I mean something like birthday cake

Update: Got a cake at Cafe Eigel. Was exactly what I needed.

Will try the rest of these suggestions over the coming weeks though.

Thank you so much everyone!