2 tablespoons butter
2/3 cup thinly sliced leek or sweet yellow onion
1 tablespoon fresh thyme leaves
3 pounds yellow crookneck or pattypan squash (thinly sliced)
4 cups hot chicken or vegetable stock
1/2 cup half and half
1 cup crumbled clue cheese (or to taste)
  Sea salt (to taste)
  freshly ground pepper (to taste)
  fresh thyme leaves (as garnish (optional))