4 tablespoons unsalted butter, plus more for greasing
1 pound sweet Italian fennel sausage, casings removed, broken into small pieces
3 large leeks, white and light-green parts only, sliced
5 green onions, chopped
½ medium butternut squash, peeled and diced (around ½ inch)
1 tbsp fennel seeds
1 tsp each kosher salt and freshly ground pepper
1 bunch kale, leaves trimmed and chopped
1 pound stale onion focaccia or rolls, cubed (around ¾ - 1 inch)
1 large egg
2 cups low-sodium chicken broth or turkey stock
1 cup diced parmesan cheese, plus ½ cup shredded
1 tsp kosher salt