Cut each tortilla lengthwise into thirds; cut each widthwise into 1/4-in. strips. Place strips and oil in a resealable plastic bag; shake to coat. Combine chili powder, salt and cayenne. Add to bag; shake to coat., Arrange tortilla strips on a baking sheet coated with cooking spray. Bake at 400degrees for 6-8 minutes or until crisp, stirring once. Remove to paper towels to cool; set aside., Meanwhile, in a Dutch oven, saute onion in oil until tender. Add garlic; cook 1 minute longer. Stir in 4 cups water, chicken base, chili powder, cumin, coriander and cayenne. Whisk masa harina and remaining water until smooth; stir into pan. Bring to a boil; cook and stir for 2 minutes or until slightly thickened., Reduce heat. Stir in process cheese until melted. Add chicken; heat through. Ladle into bowls. Top with pico de gallo, shredded cheese and tortilla strips.