Salad of Mesclun Greens with Dried Cranberries, Mascarpone Dumplings and Champagne Vinaigrette

For the dumplings and salad:

• 1/2 cup goat cheese
• 1/2 cup mascarpone cheese
• 1/4 cup chopped chives
• 4 cups cleaned loosely packed greens (such as romaine, red and green leaf lettuce, radicchio, frissee)
• 4 cups cleaned loosely packed greens (such as romaine, red and green leaf lettuce, radicchio, frissee) 
• 1/2 cup sun-dried cranberries
• 1 cup cherry or grape tomatoes, cut in 1/2

For the Champagne vinaigrette:

• 1/4 cup Champagne vinegar
• 1/2 cup Champagne
• 1 teaspoon vanilla extract
• 2 tablespoons chopped chives
• Salt
• Freshly ground black pepper 
• 1 cup grapeseed oil