Preheat oven to 350°F (175°C).
Shape a 9-inch pie tin into a shamrock design by making four small cuts along the edges and overlapping slightly.
Press the refrigerated pie crust into the shaped tin, crimping the edges to hold the design.
In a large bowl, whisk together eggs, milk, salt, and pepper. Stir in 1 cup of shredded cheese, spinach, and parsley.
Pour the egg mixture into the pie crust and spread evenly. Sprinkle the remaining cheese on top.
Bake for 30-40 minutes, or until the center is set and the top is golden brown.
Allow to cool for 5-10 minutes before slicing. Serve warm or at room temperature.