Preheat oven to 375 degrees. Mix ¾ of the feta with the ricotta in a medium bowl until mostly smooth, leaving some chunks of feta. Beat the eggs into the cheese, then add the flour and milk. Season with ½ teaspoon salt, pepper and the dill.
Butter a 10-inch cast-iron skillet or earthenware baking dish. Pour in the batter and crumble remaining cheese on top. Bake until golden, 35 to 40 minutes. Cut into wedges and serve.