Butternut Squash and Kale Soup with stems

2 -3 cups butternut squash, peeled and cubed 3 -5 leaves kale , removed from the stems and cut in strips 1/2 onion , chopped 1 garlic clove , minced 3 -5 cups[...]

1 tablespoon olive oil , plus more for pan 1/2 small butternut squash, thinly sliced (about 1 lb) 1 medium red onion , thinly sliced 1 small bunch kale ,[...]