For now, there are currently 9:
-Ways of Monster Nation
-Slime Diaries
-Trinity in Tempest
-Tenchura
-Workaholic Slime
-Shima Kosaku Crossover
-Clayman Revenge
-The short prequel chapter of the movie
-And this cooking manga
And in July its estimated that there will be another manga, it will be based on the sidestory that Fuse wrote recently, but its only on japanese:
https://ncode.syosetu.com/n7972ib/