Corn Pie with Spinach Filling Video

Fresh Spinach250 gr4 cups
Scallions1 1 bunch
Dill and Parsley1 1 bunch
Garlic, minced3 3 cloves
Egg1 1
Feta Cheese150 gr2/3 cup
Cornmeal450 gr2 1/4 cups
Oat Flour90 gr3/4 cup
Baking Powder6 gr1 teaspoon
Greek Yogurt, devided240 ml1 cup
Milk, devided360 ml1 1/2 cups
Salt and Ground Black Pepper6 gr1 teaspoon