Winter Vegetable Soup

Ingredients

• 2 tbsp butter
• 1 med onion, cut into 1/2in dice
• 2 garlic cloves, coarsely chopped
• coarse salt and ground pepper
• 1 lb acorn squash, peeled, seeded and cut into 1in chunks
• 1 bunch kale (3/4 lb), ribs cut away and discarded, leaves torn
• 5.5 c low-sodium chicken broth
• 1 can (14 oz) cannellini beans, rinsed
• 3 sprigs thyme
• grated parmesan for serving (optional)