Chard, Herb and Feta soup

After all this wacky warm weather we've been having, it's hard to look out today and see it so sunny, but know that is only in the 40s. This soup is the perfect answer: It's warming and hearty but packed with veggies and a shockingly vibrant green color so full of spring, it's practically chirping.

Chard, Herb and Feta Soup
via Bon Appetit

2 tablespoons olive oil
1 large onion, coarsely chopped
2 garlic cloves, crushed
1 pound Swiss chard leaves (center ribs and stems removed) or spinach, coarsely chopped (about 10 cups)
3 1/2 cups vegetable broth
1 cup coarsely chopped flat-leaf parsley
1/2 cup coarsely chopped fresh cilantro
1/4 cup fresh mint leaves
1 tablespoon dried mint
1 teaspoon freshly grated nutmeg
1 tablespoon fresh lemon juice
Kosher salt and freshly ground black pepper

Garnishes
5 ounces plain Greek-style yogurt (about 1/2 cup)
1/2 cup mixed chopped herbs (such as parsley, cilantro, and mint), divided
4 ounces feta, crumbled, divided
Kosher salt and freshly ground black pepper
Fresh lemon juice (optional)
Olive oil (optional)

Heat oil in a large saucepan over medium heat. Add onion and garlic and cook, stirring often, until translucent and soft (do not brown), 7–8 minutes. Stir in chard, broth, parsley, cilantro, fresh and dried mint, and nutmeg. Bring to a boil, reduce heat, and simmer, stirring occasionally, until chard is tender, about 10 minutes. Stir in lemon juice and season to taste with salt and pepper. Working in batches, purée soup in a blender until smooth. Return to pan. DO AHEAD: Can be made 8 hours ahead. Cover and chill. Rewarm soup before continuing.

Place 1/3 of yogurt in a medium bowl. Add 1/2 cup warm soup; whisk until smooth. Repeat process twice more, adding a total of 1 cup more soup. Whisk yogurt mixture into soup in saucepan. Stir 1/4 cup herbs and half of feta into soup. Season to taste with salt, pepper, and lemon juice, if desired.

Ladle soup into bowls and garnish with remaining 1/4 cup herbs and 2 oz. feta. Drizzle with oil, if desired.