Heat the skillet over medium heat and add cooking oil. Cook the ground beef, breaking it apart with a spatula, until browned and cooked through, about 8 minutes. Season with salt and pepper, then remove from heat.
Preheat the oven to 375°F (190°C). Place a tortilla on a baking sheet. Spread half of the cooked beef evenly over the tortilla, then sprinkle with 1 cup of shredded cheese. Spoon half of the tomato sauce on top of the cheese, spreading slightly for coverage.
Top with the second tortilla and repeat the layering: beef, cheese, and tomato sauce, finishing with the remaining cheese on top. Bake in the oven until the cheese melts and the edges are crispy, about 12-15 minutes. The dish should be bubbling and golden brown around the edges.
Remove from the oven and let sit for 2 minutes. Use a spatula to transfer the pizza to a cutting board. Slice into wedges and serve hot.
Optional: garnish with chopped herbs or additional toppings as desired. Serve immediately for best gooey, crispy texture.