Migas (Scrambled Eggs with Corn Tortillas)

unsalted butter, preferably clarified

small to medium yellow onion, finely diced (3/4 cup)

finely diced bell peppers (preferably a mixture of green and red)

(6-inch) corn tortillas cut into long, narrow strips (1 cup)

kosher salt

freshly ground black pepper

large eggs, beaten

shredded Monterey Jack or pepper Jack cheese

Chipotle Sour Cream (optional; see tip)

Salsa

thinly sliced scallions, (white and green parts)