Preheat oven to 375 degrees.
Heat a medium skillet over medium-high heat and add 1 tablespoon of butter. Sauté the potatoes in the butter until browned and remove from skillet.
Reduce the heat to medium and add the remaining tablespoon of butter to the skillet. Sauté the onion and garlic until the onion is soft. Remove from heat.
In a large mixing bowl, whisk together the eggs and milk. Add fresh ground pepper to taste.
Divide the potatoes, onion & garlic mixture, cheeses and peas evenly between the two pie crusts. Pour egg mixture, dividing evenly, over the top of the ingredients in the two pie crusts.
Bake in the preheated oven for 45-55 minutes until the fillings is set and the tops are golden brown.
Let stand 10 minutes before serving.