For a nice quick curry sauce (massala) take a tin of sieved toms or some passata, and add one chopped fried onion, 2teaspoon curry powder 1/2 tsp chili, 1 clove garlic either 3 inches of grated ginger or about four teaspoons of ground ginger, 4 teaspoons coriander leaves and 1 teaspoon garam massla, 2tablespoons of plain yoghurt and a dash of cream. (If you're going to buy cream for other meals like mash and lasagne etc just use cream rather than yoghurt, 1 large tub of double cream will go through lots of dinners as you only need a small amount, I always use a little bit for mash as well.)
That sauce is probaby best made in large quantities and frozen, then just add some diced chicken to it and eat with rice. My DS has eaten it since he was about your LO's age and still does now, I just used to give him a bit of sauce mixed in with rice.
It may seem like it has a lot of spices in it if you dont have them in your house, but they'll cost about £3 to get all of them and last for ages.
We also do chicken chopped into small pieces fried with onions, lemon juice and soy sauce then put in either torillas or pitta breads with rice/potato wedges.
To make your own wedges just chop potatoes lengthways into quarters, with skins on (washed) and roast in the oven for about 25minutes in a bit of oil, you can grate some cheese over in the last five/ten minutes to give a bit extra taste but I love them without anything as do my DC's, good size for finger food too.