掲示板 Forums - Happy new year in japanese

Hi! I'm making a dessert for a new year's eve party tomorrow, and I thought it'd be fun to write happy new year in Japanese on the cake since the food is supposed to be Japan-themed. But since I'm a beginner with very limited knowledge I don't know how I would write it. Does anyone know what would be appropriate? :)

I learned there are two ways to say happy new year. There’s 良いお年を which is said between dec. 26 and 31. From january 1 to the 6(?), 明けましておめでとう is said. I hope this helps