My 10 month old is getting sick of the supermarket foods, what sort of meals could i make him?

We usually give our son a big jar of food (204g) for his dinner, sometimes a small can too (120g). Lately he has been going off these supermarket foods as he gets the same ones over and over again because they dont stock a large variety of flavours. So i have been giving him as much of a jar as i can and then i make him bread with some spread on it. He will sometimes eat 2 pieces but tonight he only ate 1 and a small tin and a little bit of a big jar. He will pretty much eat everything, but i need meals that are quick and easy to make or that i can sort of just put on and they cook themselves. He is starting to get anxious if i leave the room and he starts crying (real tears, not crocodile tears) so i hate having to leave him in his play pen for too long. Our kitchen isnt big enough for me to be able to move around in if he is in his high chair in there with me. Also he only has 1 tooth, so it cant be too thick