Preheat oven to 350°F (175°C).

Spray a 9-inch pie plate with non-stick cooking spray.

Layer the defrosted hash brown potatoes in the bottom of the prepared pie plate.

Sprinkle the crumbled feta cheese evenly over the hash browns.

Distribute the diced green onions over the feta.

Sprinkle the bacon bits over the green onions.

In a separate bowl, beat the eggs.

Mix in the fat-free sour cream, salt, and pepper to taste into the beaten eggs.

Pour the egg mixture evenly over the potato and cheese layers in the pie plate.

Lightly press down to flatten the top of the mixture.

Bake in the preheated oven for 40 minutes, or until golden brown and set.

Let the frittata cool for 5 minutes before slicing and serving.