Unambigously Baked Baked Potato Soup

Name: Unambigously Baked Baked Potato Soup
Ingredients: 4 pounds potatoes (about 10 medium), washed and dried; 2 tablespoons olive oil (divided); 1 and 1/2 teaspoons coarse sea salt (divided); 3/4 teaspoon coarse black pepper (divided); 6 slices uncooked bacon (about 6 ounces total); 2 tablespoons white all-purpose flour; 3 cups chicken stock; 1/2 teaspoon fine kosher or table salt (and maybe more to taste); 1/4 teaspoon dried ground sage (and maybe more to taste); 3 cups coarsely grated cheddar cheese; 6 tablespoons sour cream; 6 tablespoons chopped green onions