In a large bowl, whisk together the 4 cups white or yellow masa , 1 cup cotija cheese and 1 teaspoon coarse Kosher salt.
Stir in the 3 ½ cups warm water and melted¼ cup unsalted butter to form a soft dough. It should be the consistency of homemade playdough.
Cover the bowl with a kitchen towel and allow it to sit for 10 minutes.
Knead the dough for a few minutes until it is smooth and soft. It should hold its shape, but be easily worked.
Divide the dough into 16 equal balls.
Pat each ball of dough into a 5 inch circle that is about ¼” thick.
Place one heaping tablespoons of the remaining mozzarella in the middle of the patty.
Sandwich another piece of dough over it and seal the edges by pinching. Seal well.
Pat the dough into a patty that is about 3-4 inches wide and a ½” thick.
Repeat with remaining balls of dough so you have 8 total. Set aside.
Heat a 12” cast iron skillet over medium high heat or an electric griddle at 325°F.
When the skillet is hot, place a small pad of butter on the skillet and spread it around to coat the surface.
Place the arepas on the skillet and cook for 3-4 minutes on each side until crispy and golden.
Transfer to a wire rack to cool while you continue cooking the rest. Keep in a warm oven.
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Notes
Arepas can be made in the Air Fryer. Simply preheat it to 350°F. Grease the basket and then cook for 5 minutes. You might have to flip them and cook for an additional 2-3 minutes on the opposite side for even browning.Exact cooking times may vary depending on your Air Fryer and also the size of the arepa. These work best using a smaller ball of dough and only a tablespoon of cheese. These instructions are also included in the notes section of the recipe card.