Preheat the oven to 425°degrees.
Slice a sugar pumpkin in half and clean out the seeds and pulp from the cavity (save for roasted pumpkin seeds!).
Cut the pumpkin into slices and/or wedges 1-2 inches thick. Make them as uniformly thick as you can.. (Slicing pumpkin isn’t easy, just do your best, everything will turn out all right). Arrange slices in a single layer on a large rimmed baking sheet.
Drizzle the olive oil on top of all the pumpkin slices.
In a small bowl mix the smoked paprika, cumin, kosher salt, garlic powder and ground coriander.
Sprinkle spice mix on top of the pumpkin slices.
Roast on a lower middle rack in oven for 35-40 minutes until pumpkin is very tender and there is some browning around the edges of the skin.