Melt the butter in a large skillet over medium heat. Add the onion and bell pepper, season with salt and pepper, and stir-fry for 2 to 3 minutes, until the onion is translucent. Add a pinch of cayenne or a little minced jalapeño, if using.
Step 2
Add the corn kernels and poblano strips, season again and continue to cook, stirring occasionally, until the corn is cooked and tender, about 5 minutes.
Step 3
Stir in the scallions, then the crème fraîche and allow it to heat through. Taste for seasoning, and give the corn a good squeeze of lime.