Preheat your oven to 375°F (190°C).
In a large mixing bowl, combine the 2 cups of leftover roast pork, 1 cup sour cream, 1 cup shredded cheddar cheese, 1 15 oz can black beans, 1 bell pepper, 1 4 oz can green chiles, 1 teaspoon cumin, 1 teaspoon chili powder, ½ teaspoon kosher salt, and ½ teaspoon ground black pepper. Stir well to ensure all ingredients are evenly incorporated.
Transfer the mixture into a greased 8x8-inch baking dish, spreading it out evenly.
Arrange the 2 cups frozen tater tots in a single layer on top of the pork mixture, covering it completely.
Place the casserole dish in the preheated oven and bake for approximately 45 minutes, or until the tater tots are golden brown and crispy.
Remove from the oven and top with additional shredded cheddar cheese. Bake for an additional 5 minutes until the cheese has melted.
Allow it to cool for a few minutes before serving.
Serve garnished with your favorite toppings.