What to cook for 15mth infant?

Hi mummies, I’m worrying my little one who been rejecting my cook after my helper left. Will you be able to advise what to introduce to him ? Lately after he reject my porridge then I will peel a banana and feed him directly . He like it so much and can finish 3/4 of it. But I can’t be feeding him bananas everyday. Any suggestion??? Help! I’m stressing cos I’m worry he didn’t have enough food intake.