In a large pot, add 1 to 2 quart of water and salt. Bring to boil. Add potatoes and boil for 15 to 20 minutes or until potatoes are tender. In a large saucepan, add oil and sauté onion, celery and garlic for 3 to 5 minutes. Add black pepper, garlic powder, cilantro and 4 tablespoons water; Stir in a little. Add butter and melt in medium-low heat. Add milk. Add 2/3 of the potatoes and mix well. In a big mixing bowl add the remaining of the potatoes and the potato mixture from the saucepan. Mash and mix well. Add bacon and ham and mix well. Divide Mash potatoes in small casserole dishes or put everything in one medium casserole dish. Top with bread crumbs and cheese. Bake at 350 °F; for 5 to 10 minutes or until cheese is melt.