Preheat oven to 400ºF.  If the carrots are thick, cut them in half lengthwise, if not , leave whole. Slice the carrots diagonally in 1 1/2 inch thick slices. (The carrots will shrink while cooking so make the slices big.) Toss them in a bowl with the olive oil, salt and pepper. Transfer to a sheet pan in 1 layer and roast in the oven for 20 minutes, until browned and tender. Toss the carrots with minced parsley, season to taste, and serve.