Crush the garlic, then add to the pan along with the turkey mince and cook over a medium-high heat, gently breaking it up as you cook.
Add in the chilli powder, cumin, paprika, chopped tomatoes and chicken broth then stir until well combined. Once boiled reduce the heat to a gentle simmer and leave for 5 minutes.
Chop the avocado, tomato, cucumber and spring onion and peel the leaves from the lettuce.
Once the mince is cooked, add 1 tablespoon of mince to each lettuce leaf, then top with avocado, tomato, spring onion and cucumber.