Heat oil in a large skillet over high heat until it shimmers. Add ground sirloin and season with salt and pepper. Cook until crumbled and brown with no pink remaining, about 4-5 minutes.
Reduce heat to medium and add taco skillet sauce to the pan. Simmer until the mixture is warm and bubbling, about 5 minutes.
Heat small skillet over medium high heat. Place tortilla in skillet and toast until lightly browned, 1-2 minutes per side. Repeat with remaining tortillas.
To serve, spoon beef in warm tortillas and top with cheese, guacamole and other garnishes, if desired.
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