Ingredients

  • 12 tablespoons unsalted butter, divided
  • 3 cups peeled and 1/2-inch-diced boiling potatoes (4 potatoes)
  • 12 extra-large eggs
  • 22 ounces ricotta cheese
  • 1 pound 2 ounces Gruyere cheese, grated
  • 1 teaspoon kosher salt
  • 1 teaspoon freshly ground black pepper
  • 1 1/4 cups chopped fresh basil leaves
  • 1/2 cup all-purpose flour
  • 1 teaspoon baking powder

Method

  • Preheat the oven to 350 degrees F. Butter and flour a 12-by-18-by-1 1/2-inch half sheet pan.
  • Melt 4 tablespoons of the butter in a 12-inch saute pan over medium-low heat.
  • Add the potatoes and fry them until cooked through, turning often, 10 to 15 minutes.
  • Melt the remaining 8 tablespoons of butter in a small saute pan and set aside.
  • Meanwhile, whisk the eggs in a large bowl, then stir in the ricotta, Gruyere, melted butter, salt, pepper, and basil.
  • Sprinkle on the flour and baking powder and stir into the egg mixture.
  • Distribute the potatoes over the bottom of the sheet pan.
  • Pour the egg mixture over the potatoes and spread evenly.
  • Bake the frittata until it is browned and puffed, 30 to 35 minutes.
  • Allow the frittata to cool and cut into 20 single-serving squares.