Kuku Sabzi

Name: Kuku Sabzi
Ingredients: 5 Tbsp. vegetable oil, divided; 1 medium onion, finely chopped; 1 medium leek, white and pale-green parts only, finely chopped; 5 large eggs; 1½ tsp. Diamond Crystal or 1 tsp. Morton kosher salt; 1 tsp. freshly ground black pepper; 1 tsp. baking powder; ½ tsp. ground turmeric; 1½ cups finely chopped cilantro; 1½ cups finely chopped dill; 1½ cups finely chopped flatleaf parsley; 1 Tbsp. dried fenugreek leaves