Step 1

Mash 1 cup beans in a small bowl with a whisk or potato masher.

Step 2

Heat oil in a large heavy pot over high heat. Add chicken; cook until browned, turning occasionally, 4 to 5 minutes. Add onion, poblanos and garlic. Cook until the onion is translucent and tender, 4 to 5 minutes.

Step 3

Add the remaining whole beans, the mashed beans, stock, salsa and salt. Bring to a boil. Reduce heat to medium and simmer until the chicken is cooked through, about 3 minutes. Stir in corn, spinach and cilantro. Cook until the spinach is wilted, about 1 minute. Serve topped with sour cream.