Cook chorizo in a large skillet over medium-high heat, stirring frequently, until sausage turns a dark red, 6 to 8 minutes. Remove from the skillet and set aside.
Melt bacon grease in the same skillet over medium-high heat. Add diced potatoes and cook, stirring occasionally, 8 to 10 minutes. Add onion and serrano pepper and continue cooking and stirring until potatoes are fork-tender, onion is translucent, and serrano pepper is soft, 2 to 6 minutes. Add eggs and chorizo; stir until cooked and completely incorporated into potato mixture, about 5 minutes. Season with salt and pepper.
Meanwhile, heat tortillas in a large skillet or directly on the grates of a gas stove until soft and pliable. Place 1/3 cup chorizo mixture down the center of each tortilla. Fold top and bottom of tortillas over the filling, then roll each into a burrito shape. Mist with cooking spray and place in the basket of an air fryer.
Air fry at 400 degrees F (200 degrees C) for 4 to 6 minutes. Flip each burrito over, mist with cooking spray, and air fry until lightly browned, 2 to 4 minutes more.
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