1. In a large cast-iron skillet, melt butter over medium heat. Add onion and jalapeño and cook until soft (57 minutes). Stir in eggs, salt, and pepper, and cook, stirring, until soft curds form (about 3 minutes).
2. Remove skillet from heat and mix in the goat cheese and chives. Serve immediately with whole-grain toast or English muffin, if desired.