Step 1

In a large skillet, heat butter over medium heat until melted. Stir in flour, cook for 1 minute and whisk in chicken broth. Continue stirring until smooth and thickened-- about 2-3 minutes.

Step 2

Stir chipotle chili powder, salt, oregano, green chiles and black olives into the sauce and place chicken breasts into pan. Bring to a simmer, reduce heat to low, cover and cook about 15 minutes or until chicken is cooked through.

Step 3

Remove chicken from pan, leaving the heat on low, and place chicken on a plate to shred into bite-sized pieces.

Step 4

Stir sour cream into the sauce and return chicken to the pan along with the tortillas. Stir until combined and top with grated cheese. Cover pan and cook for 5-8 minutes until bubbly and the cheese is melted.