Slice the sage leaves into strips.
Cut the squash in half lengthwise, cut the ends off, use a spoon to scoop out the seeds, and then cut squash crosswise into half moons that are approximately ¼- to ½-inch thick.
Heat a skillet over medium heat, then add 2 tablespoons of butter and melt.
Add the squash to the pan and sauté for 4 minutes, or until the squash is golden brown with a lightly crisp exterior. Season with salt and pepper to taste.
Flip the squash and sauté for an additional 4 minutes, until fully cooked.
Transfer the squash to a plate.
Add 1 additional tablespoon of butter to the pan and reduce to medium-low heat. If the pan seems dry, add a little bit more butter or a little olive oil. Add the chopped sage leaves and fry for about 3-5 minutes, or until crisp.
Taste the squash for seasoning, top with fried sage leaves, and serve.