Spring Minestrone with Chicken Meatballs

INGREDIENTS

• 1/2 cup fresh breadcrumbs
• Kosher salt, freshly ground pepper
• 2 tablespoons chopped fresh chives
• 6 ounces ground chicken (about 3/4 cup)
• 1 cup 1/2" rounds peeled carrots
• 1 leek, white and pale-green parts only, sliced into 1/4" rounds
• 2 tablespoons extra-virgin olive oil
• 6 tablespoons finely grated Parmesan, divided, plus more for garnish
• 3/4 cup ditalini or other small pasta
• 1 large egg, whisked to blend
• 4 garlic cloves, 2 minced, 2 thinly sliced
• Chopped fresh basil
• 5 cups low-salt chicken broth
• 1 cup (packed) baby spinach