Toast anchos and chipotle in a 12-inch dry skillet over medium heat, stirring frequently, until fragrant, 2 to 6 minutes; transfer to plate. Add oil and onion to now-empty skillet and cook over medium-high heat until softened, 5 to 7 minutes.
Stir in chocolate, cinnamon, cloves, and toasted chiles and cook until chocolate is melted and bubbly, about 2 minutes. Stir in garlic and cook until fragrant, about 30 seconds. Stir in broth, tomatoes, raisins, almond butter, and sesame seeds and bring to simmer. Reduce heat to medium and simmer gently, stirring occasionally, until slightly thickened and measuring about 3½ cups, about 7 minutes
Transfer mixture to blender and process until smooth,about 20 seconds. Season with salt, pepper, and sugar to taste. (Sauce can be refrigerated for up to 3 days; loosen with water as needed before continuing.)
Adjust oven rack to middle position and heat oven to 400 degrees. Pat chicken dry with paper towels and season with salt and pepper. Arrange chicken in single layer in shallow baking dish and cover with mole sauce, turning to coat chicken evenly. Bake, uncovered, until breasts register 160 degrees, and thighs or drumsticks register 175 degrees, 35 to 45minutes.
Remove chicken from oven, tent with aluminum foil, and let rest for 5 to 10 minutes. Sprinkle with extra sesame seeds and serve.