Whisk together eggs, milk, salt, and pepper in a medium bowl; set aside.

Heat oil in a large nonstick skillet over medium. Add chorizo, bell pepper, scallions, and chopped jalapeño; cook, stirring occasionally and breaking meat into smaller pieces, until chorizo has rendered and vegetables are softened, about 5 minutes. Reduce heat to medium-low, and pour in egg mixture; cook, stirring and folding often with a flexible spatula to form large curds, until mixture is softly set, about 3 minutes. Transfer to a medium bowl; cover to keep warm, and set aside.

While eggs cook, heat a medium nonstick skillet over medium. Arrange a few cilantro sprigs and jalapeño slices in the center of skillet. Sprinkle 1/4 cup of the cheese over top, forming an approximately 6-inch circle (it’s OK if there are gaps or holes). Cook, undisturbed, until cheese begins to bubble and is fully melted, 30 seconds to 1 minute. Place 1 tortilla on cheese, pressing down gently to adhere (edges of the cheese will not be covered by the tortilla); sprinkle 2 tablespoons of the cheese evenly over tortilla. Cook, undisturbed, until bottom cheese layer is golden brown and top cheese layer is mostly melted, 2 to 3 minutes. Remove skillet from heat; let cool slightly, about 30 seconds. Spoon a rounded 1/3 cup egg mixture onto one side of tortilla, then use a thin spatula to get underneath the crispy cheese layer; fold tortilla in half over filling. Transfer taco to a paper towel-lined plate to drain. Wipe skillet clean with a paper towel, and return to medium heat. Repeat procedure with remaining cheese, tortillas, and egg mixture. (If desired, to speed things up, once eggs are finished cooking in large skillet, wash skillet and use both pans to cook 2 tortillas at once).

To serve, sprinkle with chopped cilantro and drizzle with hot sauce.