Preheat your oven to 375°F (190°C).
In a large skillet over medium heat, cook the ground beef with the chopped onion and minced garlic until the beef is browned and the onions are translucent. Drain any excess fat.
Stir in the taco seasoning and red enchilada sauce into the beef mixture. Simmer for 5 minutes, allowing the flavors to meld. Season with salt and pepper to taste.
In a small bowl, combine the ricotta cheese and beaten egg, mixing until smooth.
Cut the keto-friendly tortillas into quarters to make them easier to layer.
In a 9x13 inch baking dish, spread a thin layer of the meat sauce.
Arrange a layer of tortilla quarters over the meat sauce, overlapping them slightly to cover the sauce.
Spread half of the ricotta mixture over the tortillas, then sprinkle with a third of the shredded cheese.
Add another layer of meat sauce, followed by more tortilla quarters, the remaining ricotta mixture, and another third of the shredded cheese.
Finish with the last layer of meat sauce, tortilla quarters, and the remaining shredded cheese.
Cover the baking dish with foil and bake in the preheated oven for 20 minutes.
Remove the foil and bake for an additional 10 minutes, or until the cheese is bubbly and lightly browned.
Let the lasagna rest for 5 minutes before slicing. Garnish with chopped cilantro and jalapeño slices if desired.