Once I discovered I could roast them in the oven, I switched to mostly buying frozen
ChaosCoati
Since it sounds like he’s used to you or your wife being there, you can try slowly removing yourself. What we did with our kid is start with a parent sitting or laying next to the bed, then every few days moving a little closer to the bedroom door. We’d still stay until they fell asleep.
Our kid got most anxious when we got to the part where moving put us out of their room, so we did that step a little more slowly where we stayed at the entrance of the bedroom but would have to leave the room for increasingly longer periods of time (go get a book to read, go to the bathroom, etc). They struggle with anxiety in general though, so your kid may not have this hurdle.
We too keep books next to their bed which they can read or look at until they get sleepy. We also have a volcano lamp we turn on at night they can watch.
Our favorites are broccoli, green beans and brussels sprouts. Take out of freezer, toss with olive oil, salt and pepper, spread out on a cookie sheet, and bake at 425F (~220C) for 20-30 minutes turning once. For broccoli I usually bake 20 min, flip, then bake another 10 min.
Sometimes when there’s 5 minutes left I sprinkle some cheese on the veggies (usually parmesan or cheddar) and let it finish baking so the cheese melts and gets crispy.