Preheat oven to 425°F. Scrub the outside of the squash with a brush until very clean. Cut ends off to create two flat edges. Cut in half lengthwise and scoop out seeds.
Cut into 1/4- to 1/2-inch slices, keeping the size of the slices consistent.
Rub, toss, or spray with olive oil so both sides of each slice are coated with oil. Sprinkle with salt and pepper and spread onto a parchment paper lined baking sheet in a single layer.
Place in preheated oven and roast for 20 minutes. Flip each slice over and roast for another 15 minutes or until golden brown and crispy on the outside and tender on the inside.