Break the eggs into a large bowl and whisk vigorously with a whisk. Fold in the scallions, bread crumbs, and cheese.

In an 8-inch, cast iron skillet, heat the olive oil over high heat. Swirl the pan to coat the sides with oil and pour in the egg mixture. Cook over medium-high heat until the frittata is set. Remove from heat and allow to rest several minutes. Slice into 4 wedges, drizzle with aceto balsamico. Sprinkle with salt and pepper and serve immediately.