Ground pasilla chile powder. Other names for this chili are chilaca and ancho. Mild in flavor and good for coloring.
PASILLA CHILI
The Pasilla is similar to a dried Ancho Chile. Pasilla, Spanish for "little raisin", have a thin flesh with some grape/berry flavors and herbaceous tones. Used in mole sauces as well as seafood sauces and casseroles. Its a mild heat flavor!! In the US its also called Ancho Chile.
Corona Real Pasilla Molido
Polvo de chile pasilla molido. 
Tu Supermercado Mexicano – Bringing authentic Mexican food to your home. ™