With accent marks:
Ка́шу ма́слом не испо́ртишь.
You can't spoil the porridge with butter.
From time immemorial, porridge was loved and respected in Russia. It was cooked from wheat, buckwheat, oats, etc. To make it tastier, people added more butter.
This Russian proverb is used to say that something good can not be bad even in large quantities.
Other Russian proverbs
Strike the iron while it's hot.
The beauty of a debt is its payment
Do not look at a given horse's teeth.
There are no friends for taste and color.
To live a life is not the same (not as easy) as to go through a field.
A well-fed man does not understand a starving one.
Patience and labor will grind everything.
The eyes are scared, but the hands are doing.