Formal:
* Voici un peu de... (This is literally "Here is a little bit of...")
* Voici quelques... (This is literally "Here are some...")
Informal:
* Voilà un peu de... (This is literally "There is a little bit of...")
* Voilà quelques... (This is literally "There are some...")
* Tiens, un peu de... (This is a bit more informal, meaning "Here, some...")
Example:
* Voici un peu de vin. (Here is some wine.)
* Voilà quelques pommes. (There are some apples.)
* Tiens, un peu de chocolat. (Here, some chocolate.)
The best way to choose the right phrase depends on the level of formality you need and the specific thing you are offering.