Your snacks depend on which champagne you will be serving. If there are dry and salty snacks on the table, it might be right to have a sweet wine for a more balanced taste experience, which is actually wrong. If there are dry snacks on the table, we recommend a dry champagne.
The Sec and Demi-sec variants are recommended to be served with a sweet dessert, for example with the wreath cake on New Year's Eve. For this purpose, a Sec or Demi-sec is the ideal choice.
If it's not the end of the year and you still want a sweet champagne, we can recommend a Moët & Chandon Nectar Imperial together with a traditional Spanish almond cake served with fresh figs.
You can see more dishes with accompanying champagne here