It's worth a try...I too have a Mr Picky. You have my sympathies...Mind you, I just tend to cook tons of different veggies for me and he looks at his boring plate with a little surprise.
Oooooooh how about roasted peppers?
Cut bell peppers in half.
Remove the seeds and the core.
Plave 1/2 a small tomato in each one.
Sprinkle over finely chopped garlic or garlic salt.
Drizzle well with olive oil, don't be shy with it.
Roast in a medium oven until they've literally collapsed and are soft.
Gorgeous.
Store in the fridge though with a little extra olive oil as they tend to go mouldy.
I used red, orange and yellow and the pan was such a colorful siught.
Or roasted zucchini?
I did roasted cauliflower once, that was pretty good too. (for yolu not him)
Brocolli steamed unti tender then mashed up with cream cheese and grated sharp cheese. Good side.