Heat oil in skillet over medium-high heat; fry tortilla strips, in batches, until crispy and golden brown, 3-5 minutes per batch. Remove with slotted spoon onto absorbent paper. Fry pasilla chile strips very briefly. Remove with slotted spoon onto absorbent paper. Set drained tortilla and chile strips, cheese, sour cream and avocado in separate serving bowls; set aside.
In saucepan set over medium-high heat, combine bouillon and Sazón with 4 cups of water;bring to boil. Stir in tomato sauce and guajillo chile. Return to boil, lower heat and simmer 5 minutes.
Stir in cilantro just before serving. To serve, add tortilla strips and cubed cheese to bottom of each soup bowl; ladle in soup. Serve with remaining condiments on the side.