Preheat the oven to 350°F (175°C). Lightly grease a 9-inch baking dish or pie plate with nonstick cooking spray.

Place the ground pork or beef in a large skillet set over medium heat. Cook, stirring frequently with a wooden spoon, until the meat is evenly browned. Carefully drain any excess fat from the skillet.

Stir the taco seasoning into the cooked meat, mixing thoroughly to ensure even distribution of flavor. If desired, add a small amount of water according to the taco seasoning package directions to help incorporate the seasoning.

Unroll the crescent roll dough from the tubes and press it evenly into the bottom of the prepared baking dish. Depending on the size of the dish, you may not need to use all the dough. Ensure that the dough covers the entire base without significant gaps.

Evenly distribute the seasoned meat mixture over the crescent roll base. Sprinkle the shredded cheese generously over the top of the meat layer.

Transfer the baking dish to the preheated oven. Bake for approximately 20 minutes, or until the crescent roll crust is golden brown and fully cooked, and the cheese has melted and become bubbly.

Remove the dish from the oven and allow it to cool for about 10 minutes before adding the fresh toppings. Scatter the chopped tomato and shredded lettuce evenly over the surface. Garnish with chopped scallions and serve with dollops of sour cream, if desired.