Nonstick cooking spray
thick-cut bacon, sliced 1" thick
(2-lb.) butternut squash, peeled, seeded, and cut into 1" pieces
medium yellow onion, finely chopped
leek, halved and sliced 1/2" thick
roughly chopped kale (from about 1 bunch)
cloves garlic, thinly sliced
chopped fresh sage
fresh thyme leaves
kosher salt
freshly ground black pepper
fresh or preshredded shredded mozzarella
shredded sharp white cheddar
panko bread crumbs
dried Italian seasoning
extra-virgin olive oil