Broccoli mascarpone soup

This is a great, simple recipe which can also serve as the basis for just about any veg soup - instead of broccoli, use cauliflower, or a mix of both, or even butternut squash.

I usually use Philly cream cheese instead of mascarpone cause that's what I have around. Also usually use onion instead of shallots, and sometimes garlic too. Cayenne pepper and chives also optional, or can use some italian seasonings (basil, thyme etc).

3 tablespoons olive oil
1 1/2 cups sliced shallots (about 6 large)
1 1/2 pounds broccoli florets, cut into 1-inch pieces
6 cups low-salt chicken broth
1 1/2 cups (12 ounces) mascarpone cheese (Italian cream cheese), divided
1/4 teaspoon cayenne pepper
3 tablespoons chopped fresh chives

Heat oil in large pot over medium heat. Add shallots; sauté 3 minutes. Add broccoli; sauté 1 minute. Add broth; bring to boil. Reduce heat to medium-low. Cover and simmer until vegetables are tender, about 10 minutes. Cool slightly.

Working in batches, transfer soup to blender; puree until smooth. Return to pot. Reserve 1/4 cup mascarpone in small bowl; cover and chill. Whisk 1 1/4 cups mascarpone and cayenne pepper into soup. Season with salt. DO AHEAD Can be made 1 day ahead. Cover; chill. Heat soup over medium heat, stirring occasionally; do not boil.

Ladle soup into bowls. Garnish with reserved mascarpone. Sprinkle with chopped chives and serve.