you can aslo say ich mag pizza this means that you like pizza. Ich ease pizza gern is also another way of saying it but if you want the easier way you should just say ich mag pizza- they all mean the same thing.

You can also say

"Ich mag Pizza" - this means that you like pizza.

"Ich esse Pizza gern" is a more formal way of saying it but if you want to say it to friends you should just say "ich mag Pizza" - they all mean the same thing.