Red bell pepper, scallion, and carrot are sautéed briefly, then mixed with cream cheese to form a bright, speckled sauce that bakes right on the chicken -- .
Heat the oven to 425 degrees F. In a medium frying pan, heat the oil over moderate heat. Add the bell pepper and cook, stirring occasionally, until starting to soften, about 3 minutes. Add the scallions and carrot and cook 2 minutes longer. Mix the vegetables with the cream cheese, 3/4 teaspoon of the salt, and 1/4 teaspoon of the black pepper.
Sprinkle the chicken breasts with the remaining 1/4 teaspoons of salt and pepper. Put the breasts in a roasting pan and spread them with the vegetable cream cheese. Bake the chicken until just done, 20 to 25 minutes.