Heat 1 tablespoon of the oil in a medium nonstick skillet over high heat just until smoking. Add the beef and cook, stirring rarely, until well browned, about 4 to 5 minutes. Remove to a plate.
Return the skillet to the stove over medium-low heat. Add the remaining 1 tablespoon of oil, half of the scallions, the garlic, and the ginger, and cook until just fragrant and starting to color, about 30 seconds. Stir in the snow peas, and cook, stirring occasionally, until bright green, about 2 minutes. Whisk in the chili-garlic sauce mixture, then remove the pan from the heat, and add the beef and accumulated juices. Toss to coat and transfer to a serving platter. Serve immediately sprinkled with remaining scallions.