Heat oven to 400ºF. Line a 12-cup muffin tin with liners.

Prepare the muffin mix according to package directions, omitting the milk and using only the eggs and yogurt. Mix in the scallions and jalapeño.

Divide the batter among the muffin cups and bake until a toothpick inserted in the center comes out clean, 15 to 18 minutes.