Microwave frozen vegetables according to package directions. Meanwhile, coat a large nonstick skillet with cooking spray and preheat over medium heat. Add ground beef and cook until meat is browned, breaking up meat as it cooks.
Add the cooked vegetables, beans, undrained diced tomatoes, chicken broth, and chipotle chile pepper. Cook over medium heat until bubbly. Stir in 1/2 cup of the shredded cheese.
Serve topped with sour cream and the remaining shredded cheese.