Heat the olive oil in a frying pan over medium heat.
Add the onion and garlic and cook for 2–3 minutes.
Add the beef mince and cook until browned.
Stir in smoked paprika, mild chilli powder and cumin. Season with salt and pepper.
Pour in the passata and simmer for 3–4 minutes until thickened.
Press the mini tortillas into a 12-hole muffin tin to form small cups.
Spoon the beef mixture into each cup and top with grated cheese.
Bake at 180°C (fan 160°C) / Gas mark 4 for 10–12 minutes until the cups are crisp and the cheese has melted.
Top with salsa, a small spoon of sour cream, and chopped chives.