
Preheat the oven to 425°F.
On a large cutting board, cut one squash in half. Use a spoon to scrape out and discard seeds. Slice the squash crosswise into 1-inch thick slices and place slices in a large bowl. Repeat with the remaining squash.
Pour the melted butter over the squash, tossing to coat. Sprinkle with the sage, seasoned salt, and black pepper. Add the parmesan cheese, tossing to coat.
On an unlined baking sheet, place the squash in a single layer. Roast until golden brown, 25 to 30 minutes, flipping the slices halfway through. Serve warm or at room temperature.