How to Make It
Preheat oven to 350°F.
Heat 1 tablespoon oil in a medium oven-safe skillet (such as cast-iron) over medium-high. Add white and light green parts of scallions and garlic and cook, stirring often, until softened but not brown, about 2 minutes. Add spinach and stir to combine. Transfer mixture to a medium bowl and let cool slightly. Wipe out skillet.
Add cream cheese, sour cream, lemon zest, lemon juice, salt, several grinds black pepper and ¼ cup of the feta to the bowl with the spinach; stir until evenly combined.
Brush skillet with 1 tablespoon oil. Separate crescent roll dough into 16 pieces and roll into balls. Arrange balls around rim of skillet. Brush with remaining 1 tablespoon oil. Transfer dip to the center of skillet and top with parmesan and remaining ¼ cup feta. Bake until the rolls are golden brown, 24 to 26 minutes. Top with reserved scallion greens and several grinds black pepper. Serve warm.