There are two ways you could write this in German. Either as a compound noun "Mutterliebe", or as a phrase "die Liebe einer Mutter". For your purpose, the phrase seems more suitable as it feels more intimate. In any case, lovely idea!

In German, you can say "Mutterliebe" to convey "a mother's love." So, for your recipe box, you can write "Mutterliebe" to express the sentiment. It's a lovely and heartfelt choice for a Christmas gift.