-
Preheat oven to 400 degrees F (200 degrees C). Grease a 10-inch cast-iron skillet or heavy round enamel or other baking pan, and place it into the oven while it preheats.
-
Place the spinach, milk, onion, leek, eggs, and olive oil into a blender, and pulse 5 to 8 times, until thoroughly mixed and the spinach, leek and onion have been chopped into very small pieces.
-
In a separate bowl, mix together the cornmeal, flour, baking powder, and salt.. Pour the spinach mixture into the cornmeal mixture, stirring to combine, and gently mix in the feta cheese.
-
Carefully pour the batter into the hot greased skillet or pan, smooth it out with a spoon, and bake until the cornbread is golden brown and a toothpick inserted into the center comes out clean, about 30 minutes.