Creamy Chicken Meatball Pasta with Greens

Ingredients

• 400 g (0.9 pound) ground chicken meat
• 1/2 onion, chopped
• 1 sprig of rosemary
• 1 tbsp chopped parsley
• 1 tbsp shredded parmesan
• 3 tbsp breadcrumbs
• 1 egg
• 1 tbsp olive oil
• 1 tsp unsalted butter
• 2 garlic cloves
• 1 tsp flour
• 1 tsp Dijon mustard
• 200 ml (3/4 cup) heavy cream
• 250 ml (1 cup) chicken broth
• 250 g (1/2 pound) mix of baby spinach, baby swiss chard, young kale
• 1/2 tsp grated nutmeg
• 300 g (10.5 oz) tagliatelle or pappardelle