Identify how you’re using cubanelle (sauté, stuffing, roasting, or quick slicing), because prep time affects texture.
Choose the closest substitute from the table: Anaheim for the closest mild pepper profile; bell pepper only if you need sweetness with less heat.
Use the listed ratio: for bell peppers, start with the ¾ ratio and add more if the dish needs more “pepper presence.”
Prep for texture match: slice similarly sized strips, and roast or sauté until tender but not collapsing.
Taste and fine-tune: if the substitute is too tangy (banana peppers), rinse/drain; if it’s too mild (bell peppers), add a small pinch of chile powder or black pepper.