Heat oil over medium heat in large pot. Saute onion, garlic and bell pepper until softened. Add rice, chili powder, cumin and Chipotle Chile powder and stir for about 1 minute until rice looks opaque. Add tomatoes, chicken broth, green chiles and salt. Bring to a boil, lower heat to low simmer and cover. Cook for about 20 minutes stirring occasionally until rice is tender. Add green onions and black beans stirring to warm through. Serve with cheese sprinkled on top and a dollop of sour cream.