Beef and Spinach Greek Pie

Ingredients

• 1 pound Ground Beef
• 1 package (10 ounces) frozen chopped spinach, defrosted, drained well
• 4 ounces herb-flavored feta cheese, crumbled
• 2 eggs, slightly beaten
• 2 teaspoons dried oregano
• 1 large onion, chopped (about 2 cups)
• 4 to 8 sheets frozen phyllo dough, defrosted, cut lengthwise into 1/2-inch thick strips (4 cups)
• 2 tablespoons extra-virgin olive oil