Combine sirloin tip steak, flour, Worcestershire sauce, chili powder, garlic powder, dried oregano and salt in a Medium Ziploc® Zip'n Steam® Bag.
Seal bag and shake gently to combine ingredients. Pat steak into single layer. Place bag in microwave.
Microwave on full power for 4 minutes (Medium bag) or 3 1/2 minutes (Large bag). If needed, microwave for additional 30-second intervals until steak is well done.
Allow bag to stand for 1 minute before handling. Gently shake bag to distribute seasonings and carefully open.
Add 2 Tablespoons lime juice and hot sauce to steak, if desired. Serve with tortillas and your favorite taco fixings.