Slow Cooker Root Vegetable Stew

Ingredients

• 1 large white onion OR 2 leeks (white portion only), chopped
• 1 lb. butternut squash, peeled, seeded and chopped
• 1 lb. carrots, peeled and chopped
• 1 lb. parsnips, peeled and chopped
• 1 lb. sweet potatoes, peeled and chopped
• 1 lb. Yukon Gold potatoes, peeled and chopped
• 2 celery ribs, stems removed and chopped
• 6 cloves garlic, peeled and thinly sliced
• 3 cups chicken or vegetable broth
• 1 bay leaf
• 1 Tbsp. fresh sage leaves, finely chopped
• 1 tsp. freshly-cracked black pepper
• 1/2 tsp. sea salt
• 2 cups chopped fresh kale