Preheat oven to 400 degrees F. Coat a rimmed baking sheet with nonstick spray or line with parchment paper.
Cut off the bottom (root) end of the cabbage and remove any loose or discolored leaves. Place the cabbage on a cutting board with the stem side down and cut it into slices about 1 inch thick.
Place the slices on the prepared baking sheet.
In a small bowl, whisk together the olive oil, garlic, salt, and pepper. Brush over one side of the cabbage, then flip the cabbage over and brush the other side.
Roast the cabbage for about 25 minutes, or until crispy at the edges and tender in the center. You don’t need to flip the cabbage, but it might be helpful - for even cooking – to rotate the baking sheet.
