1 tablespoon canola oil
1 large onion, chopped (about 2 cups)
8 ounces white button mushrooms, (about 3 cups)
3 cloves garlic, minced
2 cups cooked chopped skinless, boneless chicken breast (1 breast half)
1 teaspoon ground cumin
1 teaspoon chili powder
1 teaspoon dried oregano
2 cups baby spinach leaves, sliced into ribbons
1/2 teaspoon salt
1/4 teaspoon fresh ground black pepper
4 (10-inch) whole-grain flour tortillas
1 cup shredded Mexican cheese mix or Cheddar
1/2 cup salsa
1/4 cup reduced-fat sour cream