Sweet potato biscuits with chorizo cream gravy and Foodways Texas recipes

Name: Sweet potato biscuits with chorizo cream gravy and Foodways Texas recipes
Ingredients: 1 sweet potato (about 1/2 pound); 2 1/4 cups all-purpose flour; 1 tablespoon baking powder; 1 teaspoon salt; 1 teaspoon granulated sugar; 1/4 teaspoon chipotle powder; 8 tablespoons (1 stick) of cold butter, sliced; 1/2 cup buttermilk or half-and-half; 1 tablespoon vegetable oil; 1/4 pound Mexican chorizo, crumbled; 2 tablespoons of flour; 1 1/2 cups of milk; 1 tablespoon chopped cilantro; ground chipotle chile pepper; black pepper