Heat oil in a medium saucepan over medium-high heat. Add onion and cook, stirring, until translucent, 4 to 5 minutes. Add garlic and cook, stirring constantly, for 30 seconds. Add ground chile, cumin and oregano and cook, stirring, until fragrant, about 30 seconds more. Add beans, water and tomato paste; stir to combine. Bring to a simmer, reduce heat to medium-low and cook, stirring occasionally, until the beans are heated through and the sauce is slightly thickened, 8 to 10 minutes. Serve warm.

Ingredient Note: Ancho chile peppers, one of the most popular dried chiles used in Mexico, are dried poblano peppers. They have a mild, sweet, spicy flavor. Ground ancho chile pepper can be found in the specialty-spice section of large supermarkets, or substitute ground chili powder with a pinch of cayenne.

MAKE AHEAD TIP: Cover and refrigerate for up to 2 days. Reheat in a saucepan with 2 tablespoons water over medium-low heat, stirring occasionally, for about 5 minutes.