Heat olive oil in a large skillet over medium heat until shimmering. Add sliced onions and bell peppers, sautéing until onions are translucent and peppers are tender, about 5 minutes. Stir occasionally to prevent burning.

Add leftover taco meat to the skillet, stirring to combine with the vegetables. Cook until the meat is heated through and fragrant, about 3-4 minutes. Stir frequently to ensure even heating.

Warm a separate skillet over medium-high heat. Lay tortillas flat in the skillet, cooking until they start to puff up and develop golden brown spots, approximately 1-2 minutes per side. Flip carefully to avoid tearing, ensuring even browning and a soft, pliable texture.

Distribute the meat and vegetable mixture evenly over the tortillas. Sprinkle shredded cheese on top, ensuring each tortilla is covered. Reduce heat to low and cover the skillet to melt the cheese.

Once the cheese has melted and is bubbling gently, take the skillet off the heat. Drizzle lime juice evenly over each tortilla, ensuring it enhances the freshness and provides a bright contrast. This step adds a zesty touch, balancing the richness of the melted cheese and other ingredients.

Sprinkle salt and freshly ground black pepper over the mixture, tasting as you go to ensure the seasoning complements the existing flavors. Consider the saltiness of the taco meat and cheese, adjusting accordingly. Stir well to distribute the seasoning evenly, ensuring every bite is well-flavored and balanced.

Warm the tortillas in a dry skillet over medium heat for about 30 seconds on each side until they are pliable and slightly browned. Place them on a serving plate and top each with a generous spoonful of salsa, which provides a refreshing contrast to the seasoned meat.

Finish by adding a generous dollop of sour cream on top of each serving, followed by a sprinkle of freshly chopped cilantro. The sour cream adds a smooth, creamy texture, while the cilantro contributes a bright, herbal aroma. This combination enhances the overall presentation and provides a refreshing contrast to the warm taco meat.

To achieve a crispy texture, place the assembled tortillas on a baking sheet and position them under the broiler for 1-2 minutes. Keep a close eye to prevent burning, ensuring the cheese becomes bubbly and develops a light golden-brown color for optimal results.

Serve immediately, allowing the contrasting textures of crispy tortillas and tender meat to shine. Enjoy the vibrant flavors and satisfying crunch.