My father needs easy to prepare meal ideas. Any suggestions?

I don't know where else to put this question, so I am placing it in this category. My 79 yo mother has dementia and has had many health issues this past year. My 74 yo father has fragile health (2 bypass surgeries, chronic angina, pacemaker, stent, cancer) for the past 23 years, but has taken over being her caregiver. I try to do as much as I can to help out around the house, and we (myself and a few family members) have been bringing them meals each night for the past 9 months. He wants to become more independent and start fixing meals himself. Mom ALWAYS did the cooking. Dad worked and provided, she ran the house. I am out of ideas. Does anyone have suggestions for simple meals that he can prepare on his own? He gets severe heartburn/acid reflux if he eats spicy food or tomato based sauces, so that leaves out quite a few meal options. He does want to start eating their large meal at lunchtime, which should help out with this problem. Please understand, we are still willing to cook for them, this is his idea. I would appreciate any help or suggestions.