Yes, I give my lo pepper - and peppers, he can stand pretty spicy stuff. But he also eats raw garlic, so he's not exactly the norm.
Since you're little one doesn't like soft, smooth food, you might want to try not peeling the potatoes - that gives a bit more texture, I really like it. You can use buttermilk in the above recipe that was given as a substitute, as well. When you boil the potatoes - and you should use a kind like yukon gold or similar - cut them into chunks, put them in the water while still cold with some salt, and let everything come to a boil together. Once it's boiling it should only need to cook for around 10 minutes, depending on your potatoes.