Easy chicken and lemon all-in-one tray bake

When you want a nice easy recipe where you can chuck everything into one pan to save time (and save on the washing up), a tray bake is a great option.

This one is vaguely Mediterranean and very simple to make. All you need is:
 
Chicken thighs - I used skinless ones and allowed two per person 

Onion 

Garlic 

Tinned tomatoes (one 400g tin)
1 lemon, sliced
1-2 medium to large potatoes per person, cut into wedges
 
Dice the onion and finely chop the garlic. Fry for a few minutes over a medium heat and add the tinned tomatoes and season. Spoon into the bottom of a baking tin and mix in the potato wedges. 

Sit the chicken portions on top and top each one with a slice of lemon. Bake in a preheated oven at 180C for 45 minutes or until the chicken is cooked through.