One of the simplest and most delicious thing to do with poblanos is this.
3-5 poblanos, roasted, steamed, peeled, and cut into thin strips
1 large onion, very thinly sliced
A few tablespoons of oil
A bit of chopped garlic, if you like (I like)
1/2-1 cup crema, or cream (not sour cream for this one)
Salt to taste
Spice to taste
Cook the onions slowly over medium heat till they're sweet and golden, about 15 minutes. Add the garlic and rajas and cook for a couple more minutes, then add the crema and seasonings to taste. Simmer for a couple more minutes and serve. This makes a lovely taco fillings, or just a side dish.