Are poblano chiles spicy?
Usually they are mild to medium, with a warm, green-chile kind of heat. Every pepper has a personality, though. If you want extra mild, look for firm, glossy, dark-green poblanos. Avoid peppers with lots of red streaking (they are riper and can taste a little hotter), and if you are unsure, taste a tiny raw sliver from the tip before you commit.
Also, removing the pale inner ribs (the white pith) makes the biggest difference. The seeds can hold a little heat, but most of it lives in those ribs.
Do I have to peel the peppers?
Yes, if you want the best texture. The skin turns papery after roasting. Peeling makes the chile tender and lets the batter stick better.
Can I bake instead of fry?
You can, but it will not be the same crisp shell. Think of it as more “stuffed poblanos” than classic fried chile rellenos. For a lighter method, skip the egg batter and instead stuff the roasted chiles, set them in a baking dish, top with sauce and cheese, and bake at 400°F until hot and bubbly.
What cheese is best for chile rellenos?
Oaxaca is the classic melty choice. Mozzarella works great. Monterey Jack is also solid. If you want extra flavor, do a mix of Jack plus a little sharp cheddar.
Why is my batter falling off?
Usually one of these: the pepper is too wet, you skipped the flour dusting, or the oil is not hot enough. Dry the chiles well, dust lightly with flour, and aim for 340 to 360°F oil.