Rinse and dry kale raab. If kale raab is very large, cut in half lenghwise.

Heat oil in an 8-inch cast iron pan over medium heat. Add kale raab and fry until just wilted and bright green, 1 to 2 minutes, turning them once or twice. Do not let them brown. Remove from the pan with a slotted spoon or fork.

Lightly beat eggs in a bowl. Add Parmesan cheese, milk, salt, and pepper. Stir well to combine.

Add more oil to the pan if needed so the entire pan is covered with a thin layer of oil. Pour egg mixture into pan and cook over low to medium heat until the bottom starts to set, 3 to 5 minutes. Distribute kale raab in a decorative pattern on top and cook until eggs are set at the bottom but still moist on top, about 5 minutes.

Set an oven rack about 6 inches from the heat source and preheat the oven's broiler. Broil until eggs are fully set and top is lightly browned, 30 seconds to 2 minutes.

Remove from the oven and sprinkle with kale flowers. Serve hot or at room temperature.