One Pan Pasta with Sausage & Arugula

Ingredients for 2 large or 4 small portions:

• 2 tbsp olive oil
• 1/2 onion, diced
• 8 ounces spicy Italian sausage
• about 3 1/2 cups unsalted or low-sodium chicken broth
• 1 generous cup orecchiette pasta
• salt to taste
• 2 large handfuls roughly chopped arugula or other greens (if using something like rapini, add earlier so it has time to cook through.
• grated Parmigiano Reggiano cheese