Heat the olive oil in a pan. Sauté the chopped chicken breasts on high heat so that they do not release their water. Then add the chopped green and red peppers and continue sautéing. Add the chopped mushrooms and continue sautéing until they release their water, for about 10 minutes. Finally; add 1 peeled and chopped tomato, 1 teaspoon of salt. Cook until the tomatoes release their water.