Tumble the tortilla chips onto a serving platter that will withstand grilling. Top with as much good quality grated cheddar cheese as you fancy. Pre heat your grill and set the tortilla chips aside.
In a small bowl add the chopped cherry tomatoes, chopped red onion, half of the coriander roughly chopped, a pinch of salt and a good grinding of black pepper and drizzle with good quality olive oil. Mix together.
Pick the rest of the leaves from the stems from the coriander and set aside.
Place the cheese covered tortilla chips under the grill until the cheese is just melted. Carefully remove.
Top the cheese covered tortilla chips with the tomato and onion mixture, sliced avocado, sliced red chilli and crumble the feta cheese over the top. Finely sprinkle with the coriander leaves. Serve immediately.