Ingreadient

• 1/2 cup chopped onion
• 1 tablespoon butter
• 1 garlic clove, minced
• 1 cup reduced-fat sour cream
• 3 tablespoons all-purpose flour
• 1 cup reduced-sodium chicken broth
• 1 can (4 ounces) chopped green chiles
• 1 teaspoon ground coriander
• 1/4 teaspoon pepper
• 1 cup shredded reduced-fat mexican cheese blend, divided
• 2 cups coarsely chopped real or imitation crabmeat
• 8 flour tortillas (6 inches), warmed
• 1/2 cup chopped tomato
• 1/2 cup chopped green onions
• 1/4 cup chopped ripe olives