In 10-inch nonstick skillet, combine sliced pork chops, tomatoes, pizza sauce and mushrooms. Cook over medium heat, stirring, until heated through, about 5 minutes. Meanwhile, toast bread under broiler; arrange bread on serving plates. Reduce heat to low; top mixture with cheese and cover to melt cheese, about 1 to 2 minutes. Spoon a portion of the pork mixture onto each slice of toast; season to taste with pepper and serve immediately.