Heat a small pot over medium heat. Add the butter and melt. Add the flour to the butter and cook for 1 minute. Whisk in the milk and season the sauce with salt and the chipotle powder or smoked paprika. Stir in the cheese and melt. Thicken the sauce for one minute. Stir in the salsa and remove from the heat. Serve the sauce from the hot pot and return it to the stove, as necessary, to loosen.
Cut the carrots in half, then stand them on end and cut them into thin strips. Cut the strips crosswise on an angle, forming two long triangles. Lightly salt the carrots. Pile the chips into a bowl and tuck the carrots in and around the chips. The blue and orange triangles are your “witches hats.”