Preheat oven to 350 degrees and brush a 9x13 baking pan with the melted butter.
Whisk together the eggs, pepperjack cheese, cottage cheese, flour, and salt in a large bowl. Pour the mixture into the prepared baking dish.
Bake in the preheated oven until eggs are completely set about 50-60 minutes. Start checking it around 45 minutes. Let rest for at least 10 minutes before cutting into squares. Serve with salsa, sour cream, guacamole, tomatoes, or onions if desired.
