Place potatoes, chicken stock, pepper, garlic, sun-dried tomatoes and olive oil in a large, flat-bottomed pan over medium-high heat. Bring to a boil; reduce heat and simmer on medium heat, covered, until potatoes are very tender, about 20 minutes. Remove from heat; sprinkle Parmesan over potatoes and mash with a hand masher. Add salt to taste. Stir in basil and serve.