Step 1

Preheat the oven to 350°F and set an oven rack in the middle position. Grease a 1.5-qt baking dish (mine is an oval that measures about 9 x 7 inches) or 9-inch pie pan with 1 tablespoon of the oil.

Step 2

Heat the remaining 2 tablespoons of oil in a large nonstick skillet over medium-high heat. Add the spinach and cook, tossing frequently, until wilted, 4 to 5 minutes. Set aside.

Step 3

In a large bowl, combine the eggs, yogurt, polenta, garlic, salt and pepper; whisk until smooth. Add the feta, pecorino Romano, and dill, and whisk until evenly combined. Stir in the wilted spinach.

Step 4

Pour the mixture into the prepared baking dish or pie pan, and bake until just set and puffed, 20 to 25 minutes. Serve hot or at room temperature.