You're not gonna tell if a cake is edible and good enough to sell by the cooking point or the time spent in the oven, but by the behavior of the cake and if it's appearance is matching the flavor it's supposed to be. Also, by it's health state, dumbass.
If the cake is frantically crying, that's probably it's natural reaction to seeing a knife. If you haven't shown a knife to it yet... then it's a lot smarter than average cakes.
But that's not necessarily a bad thing. Just annoying. It won't last long anyway. Just kissing it in the forehead and telling it it's okay must work.
Cake Mortys can have tons of different flavors, including the classics. Be careful - extremely high concentrations of special ingredients can affect the cake's behavior.
Those cakes are baked instantly, using extremely high temperatures of radiation. The process can be unstable and lead to infections and mutations affecting the cakes' edibility, with higher probabilities depending on the flavor of said cake.
Common flavors such as Vanilla and Chocolate have around 0000,9% probability of mutation. However, special flavors, such as Lemon and Strawberry, have 30% of chance to be affected, what makes them more expensive than the average flavors of Cake Mortys.
A cake can also suffer permanent heat injuries during baking, and that (most of times) instantly kills the cake, making it inappropriate to be sold. That happens because a dot of any material that shouldn't be with the cake, creates an isolated concentration of heat into one point, frying the cake from the inside out like a lazer shot.
And there are other small inconveniences that can happen with just baked Cake Mortys. For example, they can be able to talk - what's not supposed to happen. Don't forget they're just cakes. Cakes don't speak. What are you, nuts? talking to fuckin cakes?
Slice it down. Don't let it get into you. Don't be a baby. It's just a cake. It's not real.