How to Make It
Heat a large skillet over high; add chiles; cook 90 seconds or until fragrant, turning often. Place in a large heatproof bowl. Cover with 1 cup boiling water; let stand 30 minutes. Drain well; place chiles in a blender.
Heat 1 1/2 teaspoons oil in a medium skillet over medium. Add onion and garlic; cook 20 minutes, stirring occasionally. Place onion mixture in blender; add vinegar, brown sugar, oregano, 1/2 cup water, and 3/4 teaspoon salt; process until very smooth, stopping to scrape down sides. Pour mixture through a fine-mesh strainer into a bowl; discard solids. Return mixture to pan; bring to a simmer. Cook 5 minutes or until warm, stirring frequently.
Combine potato and remaining 4 cups water in a medium saucepan over high; bring to a boil. Add carrot; reduce heat to medium. Cook 10 minutes or until tender. Drain well; set aside.
Heat a large nonstick skillet over medium-high. Using tongs, place 2 tortillas in pan; cook 3 minutes or until dry, turning often. Dip tortillas lightly in chile mixture; place on a plate. Repeat process with remaining tortillas.
Heat a large nonstick skillet over medium-high. Add remaining 2 tablespoons oil. Add potato mixture, remaining chile mixture, and remaining 1/2 teaspoon salt; sauté 5 minutes or until vegetables are browned. Spoon 3 tablespoons potato mixture into each tortilla; fold in half. Place 2 enchiladas on each of 6 plates; sprinkle each enchilada with about 1 tablespoon cheese; top each serving with 1 teaspoon crema, 2 tablespoons cabbage, 1 tablespoon diced white onion, and 1 tablespoon cilantro.