Plate warm, fresh-out-the-pan potatoes over cool hummus, greens, and scallions to make this hearty side the true star of the show.
In large nonstick skillet, heat 3 tbsp. oil over medium-high. Add potatoes; season with salt. Cook, stirring occasionally, until golden brown, about 14 minutes. On platter, spread hummus. Arrange half of arugula on top. Top with potatoes, scallions, and remaining arugula. Drizzle with remaining 1 tbsp. oil. Serve with lemon wedges.