Heat the oven to 425 degrees.Toss the cauliflower florets in 2 tbsp of olive oil and the salt.Arrange the florets on a sheet pan that is lined with parchment. Make sure they have their own space so they will properly brown. Roast for 20-24 minutes, depending on the size of the florets. Flip them over halfway through. While they are roasting, prepare the topping by combining the panko, Parmesan thyme, black pepper and 1 tbsp olive oil in a small bowl. When the florets are finished roasting, scoot them closer together on the pan so that the topping mostly stays on the cauliflower and not on the pan itself. Spoon the topping onto each the florets. Some of it will fall in between them onto the pan, but that is fine. Roast for another 8 minutes, or until the topping is golden and crisp.