Heat a large non-stick frying pan over a medium heat. Add beef mince and cook for 5 minutes, stirring frequently until browned. Drain off any excess fat.
Add mushrooms and cook for a further 2-3 minutes stirring frequently.
Add taco seasoning mix and 180ml water and cook for a further 10-15 minutes, stirring occasionally.
Heat the flour tortillas when ready to serve.
Layer up with all ingredients, top with salsa and enjoy.