Well, I can clear away some of the easy ones, anyway.

Top row:
1.
2. Ghostbusters
3.
4.
5. Spider-Man
Second row:
6.
7.
8. I was thinking Quicksilver, but it’s not, is it?
9. Punisher? I mean, it looks right, but it should be white-on-black.
10. ThunderCats
11.
Third row:
12. Transformers (Decepticons?)
13. That’s not Elongated Man, is it?
14.
15.
16.
17. Captain America
18. Transformers (Autobots?)
Fourth row:
19. Rorschach
20. Green Lantern
21.
22. Blue Beetle
23.
24. Flash

3. Green Arrow?
4. Orange Lantern
6. The Imperial seal from Star Wars
7. Nightcrawler
8. I second Quicksilver
11. Magneto? Wonder Man?
13. Yes, I think it is Ralph
14. Spawn?
15. POWER GIRL!
23. Booster Gold

1.
2. Ghostbusters
3. Green Arrow & Black Canary
4. Red Lantern (done in orange)
5. Venom

6. The Empire
7. Nightcrawler Bamfing
8. Quicksilver
9. The Punisher
10. Thundercats
11.

12. Decepticons
13. Elongated Man
14. Deadpool
15. Power-Girl
16. Iron Man
17. Captain America
18. Autobots

19. Rorschach
20. Green Lantern
21. B.P.R.D.
22. Blue Beetle
23. Booster Gold
24. The Flash

And they all look tasty!

11. Old School Giant Man (Hank Pym)???

11 is Ant-man, i think.

I think the first one is Ex Machina

Why would anyone do a Power Girl cupcake using the initials of her logo?

That makes no sense.

You need two large cupcakes to do Power Girl justice.

Awww I want the Booster Gold one!

1 is meant to be Ex Machina I think
11 is definitely Giant-Man

Now that ya mention it, 1 does look like the Great Machine logo.

PG cupcake should definitely just be the hole in the shirt, although it might just look like a “boobs cupcake”. Hehehehe

11. Giant Man … isn’t a perfect match but its the closest I can find