Step 1: Preheat oven to 400 degrees F (200 degrees C).
Step 2: Toss butternut squash with olive oil and garlic in a large bowl. Season with salt and black pepper. Arrange coated squash on a baking sheet.
Step 3: Roast in the preheated oven until squash is tender and lightly browned, 25 to 30 minutes.