Slow-Cooker Beef Fajitas Ingredients 1-1/2 pounds beef flank steak 1 cup chopped onion 1 red or green bell pepper, cut into 1/2″ pieces 1 jalapeno pepper, chopped fine 1 15-ounce can diced tomatoes, undrained 2 cloves garlic, minced 1 tablespoon dried cilantro 1 teaspoon chili powder 1 teaspoon ground cumin 1 teaspoon ground coriander 1-1/4